Merge feat/soak-harness: multiplayer soak & UX test harness + v3.3.4

29 commits implementing a standalone Playwright-based soak runner
that drives 16 authenticated browser sessions across 4 concurrent
rooms. Two scenarios (populate + stress with chaos injection),
click-to-watch live video via CDP screencast, per-room failure
isolation, and test-account separation via is_test_account column.

Server-side: schema migration, register flow flagging, stats
include_test filter, admin panel badges + toggle.

Harness: tests/soak/ package with SessionPool, RoomCoordinator,
Watchdog, Dashboard (HTTP+WS), Screencaster, 27 Vitest tests.

Version bumped from v3.1.6 to v3.3.4.

client/admin.html

@@ -114,6 +114,10 @@
                         <input type="checkbox" id="include-banned" checked>
                         Include banned
                     </label>
+                    <label class="checkbox-label">
+                        <input type="checkbox" id="include-test" checked>
+                        Include test accounts
+                    </label>
                 </div>
                 <table id="users-table" class="data-table">
                     <thead>
@@ -396,6 +400,8 @@
     <!-- Toast Container -->
     <div id="toast-container"></div>
 
+    <footer class="app-footer" style="text-align: center; padding: 16px; color: #888; font-size: 12px;">v3.3.4 &copy; Aaron D. Lee</footer>
+
     <script src="admin.js"></script>
 </body>
 </html>

client/admin.js

@@ -67,12 +67,13 @@ async function getStats() {
     return apiRequest('/api/admin/stats');
 }
 
-async function getUsers(query = '', offset = 0, includeBanned = true) {
+async function getUsers(query = '', offset = 0, includeBanned = true, includeTest = true) {
     const params = new URLSearchParams({
         query,
         offset,
         limit: PAGE_SIZE,
         include_banned: includeBanned,
+        include_test: includeTest,
     });
     return apiRequest(`/api/admin/users?${params}`);
 }
@@ -306,15 +307,19 @@ async function loadUsers() {
     try {
         const query = document.getElementById('user-search').value;
         const includeBanned = document.getElementById('include-banned').checked;
-        const data = await getUsers(query, usersPage * PAGE_SIZE, includeBanned);
+        const includeTest = document.getElementById('include-test').checked;
+        const data = await getUsers(query, usersPage * PAGE_SIZE, includeBanned, includeTest);
 
         const tbody = document.querySelector('#users-table tbody');
         tbody.innerHTML = '';
 
         data.users.forEach(user => {
+            const testBadge = user.is_test_account
+                ? ' <span class="badge badge-info" title="Soak harness test account">Test</span>'
+                : '';
             tbody.innerHTML += `
                 <tr>
-                    <td>${escapeHtml(user.username)}</td>
+                    <td>${escapeHtml(user.username)}${testBadge}</td>
                     <td>${escapeHtml(user.email || '-')}</td>
                     <td><span class="badge badge-${user.role === 'admin' ? 'info' : 'muted'}">${user.role}</span></td>
                     <td>${getStatusBadge(user)}</td>
@@ -447,10 +452,13 @@ async function loadInvites() {
                     : invite.remaining_uses <= 0
                         ? '<span class="badge badge-warning">Used Up</span>'
                         : '<span class="badge badge-success">Active</span>';
+            const testSeedBadge = invite.marks_as_test
+                ? ' <span class="badge badge-info" title="Creates test accounts">Test-seed</span>'
+                : '';
 
             tbody.innerHTML += `
                 <tr>
-                    <td><code>${escapeHtml(invite.code)}</code></td>
+                    <td><code>${escapeHtml(invite.code)}</code>${testSeedBadge}</td>
                     <td>${invite.use_count} / ${invite.max_uses}</td>
                     <td>${invite.remaining_uses}</td>
                     <td>${escapeHtml(invite.created_by_username)}</td>
@@ -827,6 +835,10 @@ document.addEventListener('DOMContentLoaded', () => {
         usersPage = 0;
         loadUsers();
     });
+    document.getElementById('include-test').addEventListener('change', () => {
+        usersPage = 0;
+        loadUsers();
+    });
     document.getElementById('users-prev').addEventListener('click', () => {
         if (usersPage > 0) {
             usersPage--;

client/index.html

@@ -55,7 +55,7 @@
 
             <p id="lobby-error" class="error"></p>
 
-            <footer class="app-footer">v3.1.6 &copy; Aaron D. Lee</footer>
+            <footer class="app-footer">v3.3.4 &copy; Aaron D. Lee</footer>
         </div>
 
         <!-- Matchmaking Screen -->
@@ -288,7 +288,7 @@
                 <p id="waiting-message" class="info">Waiting for host to start the game...</p>
             </div>
 
-            <footer class="app-footer">v3.1.6 &copy; Aaron D. Lee</footer>
+            <footer class="app-footer">v3.3.4 &copy; Aaron D. Lee</footer>
         </div>
 
         <!-- Game Screen -->

docs/soak-harness-bringup.md

@@ -0,0 +1,125 @@
+# Soak Harness Bring-Up
+
+One-time setup steps before running `tests/soak` against an environment.
+
+## Prerequisites
+
+- An invite code exists with 16+ available uses
+- You have psql access to the target DB (or admin SQL access via some other means)
+
+## 1. Flag the invite code as test-seed
+
+Any account registered with a `marks_as_test=TRUE` invite code gets
+`users_v2.is_test_account=TRUE`, which keeps it out of real-user stats.
+
+### Staging
+
+Invite code: `5VC2MCCN` (16 uses, provisioned 2026-04-10).
+
+```sql
+UPDATE invite_codes SET marks_as_test = TRUE WHERE code = '5VC2MCCN';
+SELECT code, max_uses, use_count, marks_as_test FROM invite_codes WHERE code = '5VC2MCCN';
+```
+
+Expected: `marks_as_test | t`.
+
+From your workstation:
+
+```bash
+ssh root@129.212.150.189 \
+  'docker compose -f /opt/golfgame/docker-compose.staging.yml exec -T postgres psql -U postgres -d golfgame' <<'SQL'
+UPDATE invite_codes SET marks_as_test = TRUE WHERE code = '5VC2MCCN';
+SELECT code, max_uses, use_count, marks_as_test FROM invite_codes WHERE code = '5VC2MCCN';
+SQL
+```
+
+### Production
+
+Invite code — to be provisioned when production seeding is needed. Same pattern:
+
+```bash
+ssh root@165.245.152.51 \
+  'docker compose -f /opt/golfgame/docker-compose.prod.yml exec -T postgres psql -U postgres -d golfgame' <<'SQL'
+UPDATE invite_codes SET marks_as_test = TRUE WHERE code = '<PROD_INVITE_CODE>';
+SQL
+```
+
+### Local dev
+
+The local dev environment uses the `SOAKTEST` invite code. Create it once
+(if you wiped the DB since the last run):
+
+```sql
+INSERT INTO invite_codes (code, created_by, expires_at, max_uses, is_active, marks_as_test)
+SELECT 'SOAKTEST', id, NOW() + INTERVAL '10 years', 100, TRUE, TRUE
+FROM users_v2 LIMIT 1
+ON CONFLICT (code) DO UPDATE SET marks_as_test = TRUE;
+```
+
+Note: `created_by` references any existing user (the FK doesn't require admin role).
+If your dev DB has zero users, register one first via the UI or `curl`.
+
+Connection string for local dev:
+
+```bash
+PGPASSWORD=devpassword psql -h localhost -U golf -d golf
+```
+
+## 2. Verify the schema migrations applied
+
+The server-side changes (columns, matview rebuild, stats filter) run automatically
+on server startup via `SCHEMA_SQL` in `server/stores/user_store.py`. After the
+server-side changes deploy, verify against each target environment:
+
+```sql
+-- All four should return matching rows
+\d users_v2           -- look for is_test_account column
+\d invite_codes       -- look for marks_as_test column
+\d leaderboard_overall -- look for is_test_account column
+\di idx_users_test_account
+```
+
+If `leaderboard_overall` doesn't show the new column, the matview rebuild
+didn't run. Check server startup logs for errors around `initialize_schema`.
+
+## 3. Run the harness
+
+Once the harness is built (Tasks 9+ of the implementation plan):
+
+```bash
+cd tests/soak
+npm install
+
+# First run only: seed 16 accounts via the invite code
+TEST_URL=https://staging.adlee.work SOAK_INVITE_CODE=5VC2MCCN npm run seed
+
+# Smoke test against local dev
+TEST_URL=http://localhost:8000 SOAK_INVITE_CODE=SOAKTEST npm run smoke
+
+# Populate staging scoreboard
+TEST_URL=https://staging.adlee.work SOAK_INVITE_CODE=5VC2MCCN npm run soak:populate
+
+# Stress test
+TEST_URL=https://staging.adlee.work SOAK_INVITE_CODE=5VC2MCCN npm run soak:stress
+```
+
+See `tests/soak/README.md` for the full flag reference.
+
+## 4. Verify test account filtering works end-to-end
+
+After a soak run, the soak-seeded accounts should be visible to admins but
+hidden from public stats:
+
+```bash
+# Should return no soak_* usernames (test accounts hidden by default)
+curl -s "https://staging.adlee.work/api/stats/leaderboard?metric=wins" | jq '.entries[] | select(.username | startswith("soak_"))'
+
+# Should return the soak_* accounts when explicitly requested
+curl -s "https://staging.adlee.work/api/stats/leaderboard?metric=wins&include_test=true" | jq '.entries[] | select(.username | startswith("soak_"))'
+```
+
+In the admin panel:
+
+- Users tab shows a `[Test]` badge next to soak accounts
+- Invite codes tab shows `[Test-seed]` next to the flagged code
+- "Include test accounts" checkbox (default checked) toggles visibility

docs/superpowers/plans/2026-04-10-multiplayer-soak-test.md

@@ -71,7 +71,7 @@ END $$;
 Find the indexes block near line 338. After the existing `idx_users_banned` index (line ~344), add:
 
 ```sql
-CREATE INDEX IF NOT EXISTS idx_users_v2_is_test_account ON users_v2(is_test_account)
+CREATE INDEX IF NOT EXISTS idx_users_test_account ON users_v2(is_test_account)
     WHERE is_test_account = TRUE;
 ```
 
@@ -142,7 +142,7 @@ Connect to the dev database and confirm:
 psql -d golfgame -c "\d users_v2" | grep is_test_account
 psql -d golfgame -c "\d invite_codes" | grep marks_as_test
 psql -d golfgame -c "\d leaderboard_overall" | grep is_test_account
-psql -d golfgame -c "\di idx_users_v2_is_test_account"
+psql -d golfgame -c "\di idx_users_test_account"
 ```
 
 Expected: all four commands return matching rows.
@@ -196,7 +196,7 @@ ssh root@129.212.150.189 << 'REMOTE'
 
     -- Partial index
     SELECT indexname, indexdef FROM pg_indexes
-    WHERE indexname = 'idx_users_v2_is_test_account';
+    WHERE indexname = 'idx_users_test_account';
 SQL
 REMOTE
 ```
@@ -205,7 +205,7 @@ Expected (all four present):
 - `users_v2.is_test_account` with default `false`
 - `invite_codes.marks_as_test` with default `false`
 - `leaderboard_overall` has an `is_test_account` column
-- `idx_users_v2_is_test_account` exists
+- `idx_users_test_account` exists
 
 If any of these are missing, the server didn't actually restart (or restarted but the container has a stale image). Check `docker compose logs golfgame` for the line `User store schema initialized` — if it's not there, the migration never ran.
 
@@ -5383,7 +5383,7 @@ Run after the server-side changes (Tasks 1–7) ship to each environment.
 - [ ] `\d users_v2` on target DB shows `is_test_account` column with default `false`
 - [ ] `\d invite_codes` shows `marks_as_test` column with default `false`
 - [ ] `\d leaderboard_overall` shows `is_test_account` column
-- [ ] `\di idx_users_v2_is_test_account` shows the partial index
+- [ ] `\di idx_users_test_account` shows the partial index
 - [ ] `SELECT count(*) FROM leaderboard_overall` returns nonzero (view re-populated after rebuild)
 - [ ] Default leaderboard query still works: `curl .../api/stats/leaderboard` returns entries
 - [ ] `?include_test=true` parameter is accepted (no 422/500)

docs/superpowers/specs/2026-04-10-multiplayer-soak-test-design.md

@@ -309,7 +309,7 @@ Two new columns + one partial index:
 
 ```sql
 ALTER TABLE users_v2 ADD COLUMN IF NOT EXISTS is_test_account BOOLEAN DEFAULT FALSE;
-CREATE INDEX IF NOT EXISTS idx_users_v2_is_test_account ON users_v2(is_test_account)
+CREATE INDEX IF NOT EXISTS idx_users_test_account ON users_v2(is_test_account)
   WHERE is_test_account = TRUE;
 ALTER TABLE invite_codes ADD COLUMN IF NOT EXISTS marks_as_test BOOLEAN DEFAULT FALSE;
 ```

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "golfgame"
-version = "3.1.6"
+version = "3.3.4"
 description = "6-Card Golf card game with AI opponents"
 readme = "README.md"
 requires-python = ">=3.11"

server/models/user.py

@@ -45,6 +45,7 @@ class User:
         is_banned: Whether user is banned.
         ban_reason: Reason for ban (if banned).
         force_password_reset: Whether user must reset password on next login.
+        is_test_account: True for accounts created by the soak test harness.
     """
     id: str
     username: str
@@ -66,6 +67,7 @@ class User:
     is_banned: bool = False
     ban_reason: Optional[str] = None
     force_password_reset: bool = False
+    is_test_account: bool = False
 
     def is_admin(self) -> bool:
         """Check if user has admin role."""
@@ -100,6 +102,7 @@ class User:
             "is_banned": self.is_banned,
             "ban_reason": self.ban_reason,
             "force_password_reset": self.force_password_reset,
+            "is_test_account": self.is_test_account,
         }
         if include_sensitive:
             d["password_hash"] = self.password_hash
@@ -146,6 +149,7 @@ class User:
             is_banned=d.get("is_banned", False),
             ban_reason=d.get("ban_reason"),
             force_password_reset=d.get("force_password_reset", False),
+            is_test_account=d.get("is_test_account", False),
         )
 
 

server/routers/admin.py

@@ -84,6 +84,7 @@ async def list_users(
     offset: int = 0,
     include_banned: bool = True,
     include_deleted: bool = False,
+    include_test: bool = True,
     admin: User = Depends(require_admin_v2),
     service: AdminService = Depends(get_admin_service_dep),
 ):
@@ -96,6 +97,10 @@ async def list_users(
         offset: Results to skip.
         include_banned: Include banned users.
         include_deleted: Include soft-deleted users.
+        include_test: Include soak-harness test accounts (default true).
+            Admins see all accounts by default; pass ?include_test=false
+            to hide test accounts. Public stats endpoints default to
+            hiding them.
     """
     users = await service.search_users(
         query=query,
@@ -103,6 +108,7 @@ async def list_users(
         offset=offset,
         include_banned=include_banned,
         include_deleted=include_deleted,
+        include_test=include_test,
     )
     return {"users": [u.to_dict() for u in users]}
 

server/routers/auth.py

@@ -245,11 +245,23 @@ async def register(
             )
 
     # --- Invite code validation ---
+    is_test_account = False
     if has_invite:
         if not _admin_service:
             raise HTTPException(status_code=503, detail="Admin service not initialized")
         if not await _admin_service.validate_invite_code(request_body.invite_code):
             raise HTTPException(status_code=400, detail="Invalid or expired invite code")
+        # Check if this invite flags new accounts as test accounts
+        invite_details = await _admin_service.get_invite_code_details(request_body.invite_code)
+        if invite_details and invite_details.get("marks_as_test"):
+            is_test_account = True
+            logger.info(
+                "test_seed_account_registering",
+                extra={
+                    "username": request_body.username,
+                    "invite_code": request_body.invite_code,
+                },
+            )
     else:
         # No invite code — check if open signups are allowed
         if config.INVITE_ONLY and config.DAILY_OPEN_SIGNUPS == 0:
@@ -277,6 +289,7 @@ async def register(
         username=request_body.username,
         password=request_body.password,
         email=request_body.email,
+        is_test_account=is_test_account,
     )
 
     if not result.success:

server/routers/stats.py

@@ -159,6 +159,7 @@ async def get_leaderboard(
     metric: str = Query("wins", pattern="^(wins|win_rate|avg_score|knockouts|streak|rating)$"),
     limit: int = Query(50, ge=1, le=100),
     offset: int = Query(0, ge=0),
+    include_test: bool = Query(False, description="Include soak-harness test accounts"),
     service: StatsService = Depends(get_stats_service_dep),
 ):
     """
@@ -172,8 +173,9 @@ async def get_leaderboard(
     - streak: Best win streak
 
     Players must have 5+ games to appear on leaderboards.
+    By default, soak-harness test accounts are hidden.
     """
-    entries = await service.get_leaderboard(metric, limit, offset)
+    entries = await service.get_leaderboard(metric, limit, offset, include_test)
 
     return {
         "metric": metric,
@@ -228,10 +230,11 @@ async def get_player_stats(
 async def get_player_rank(
     user_id: str,
     metric: str = Query("wins", pattern="^(wins|win_rate|avg_score|knockouts|streak|rating)$"),
+    include_test: bool = Query(False, description="Include soak-harness test accounts"),
     service: StatsService = Depends(get_stats_service_dep),
 ):
     """Get player's rank on a leaderboard."""
-    rank = await service.get_player_rank(user_id, metric)
+    rank = await service.get_player_rank(user_id, metric, include_test)
 
     return {
         "user_id": user_id,
@@ -348,11 +351,12 @@ async def get_my_stats(
 @router.get("/me/rank", response_model=PlayerRankResponse)
 async def get_my_rank(
     metric: str = Query("wins", pattern="^(wins|win_rate|avg_score|knockouts|streak|rating)$"),
+    include_test: bool = Query(False, description="Include soak-harness test accounts"),
     user: User = Depends(require_user),
     service: StatsService = Depends(get_stats_service_dep),
 ):
     """Get current user's rank on a leaderboard."""
-    rank = await service.get_player_rank(user.id, metric)
+    rank = await service.get_player_rank(user.id, metric, include_test)
 
     return {
         "user_id": user.id,

server/services/admin_service.py

@@ -38,6 +38,7 @@ class UserDetails:
     is_active: bool
     games_played: int
     games_won: int
+    is_test_account: bool = False
 
     def to_dict(self) -> dict:
         return {
@@ -55,6 +56,7 @@ class UserDetails:
             "is_active": self.is_active,
             "games_played": self.games_played,
             "games_won": self.games_won,
+            "is_test_account": self.is_test_account,
         }
 
 
@@ -123,6 +125,7 @@ class InviteCode:
     max_uses: int
     use_count: int
     is_active: bool
+    marks_as_test: bool = False
 
     def to_dict(self) -> dict:
         return {
@@ -135,6 +138,7 @@ class InviteCode:
             "use_count": self.use_count,
             "is_active": self.is_active,
             "remaining_uses": max(0, self.max_uses - self.use_count),
+            "marks_as_test": self.marks_as_test,
         }
 
 
@@ -316,6 +320,7 @@ class AdminService:
         offset: int = 0,
         include_banned: bool = True,
         include_deleted: bool = False,
+        include_test: bool = True,
     ) -> List[UserDetails]:
         """
         Search users by username or email.
@@ -326,6 +331,10 @@ class AdminService:
             offset: Number of results to skip.
             include_banned: Include banned users.
             include_deleted: Include soft-deleted users.
+            include_test: Include soak-harness test accounts (default True).
+                Admins see all accounts by default; the admin UI provides a
+                toggle to hide test accounts. Public stats endpoints use the
+                opposite default (False) so real users never see soak traffic.
 
         Returns:
             List of user details.
@@ -336,6 +345,7 @@ class AdminService:
                        u.email_verified, u.is_banned, u.ban_reason,
                        u.force_password_reset, u.created_at, u.last_login,
                        u.last_seen_at, u.is_active,
+                       COALESCE(u.is_test_account, FALSE) as is_test_account,
                        COALESCE(s.games_played, 0) as games_played,
                        COALESCE(s.games_won, 0) as games_won
                 FROM users_v2 u
@@ -356,6 +366,9 @@ class AdminService:
             if not include_deleted:
                 sql += " AND u.deleted_at IS NULL"
 
+            if not include_test:
+                sql += " AND (u.is_test_account = FALSE OR u.is_test_account IS NULL)"
+
             sql += f" ORDER BY u.created_at DESC LIMIT ${param_num} OFFSET ${param_num + 1}"
             params.extend([limit, offset])
 
@@ -377,6 +390,7 @@ class AdminService:
                     is_active=row["is_active"],
                     games_played=row["games_played"] or 0,
                     games_won=row["games_won"] or 0,
+                    is_test_account=row["is_test_account"],
                 )
                 for row in rows
             ]
@@ -385,6 +399,10 @@ class AdminService:
         """
         Get detailed user info by ID.
 
+        Note: Returns the user regardless of is_test_account status.
+        Filtering by test-account only applies to list views
+        (search_users). If you know the ID, you get the row.
+
         Args:
             user_id: User UUID.
 
@@ -398,6 +416,7 @@ class AdminService:
                        u.email_verified, u.is_banned, u.ban_reason,
                        u.force_password_reset, u.created_at, u.last_login,
                        u.last_seen_at, u.is_active,
+                       COALESCE(u.is_test_account, FALSE) as is_test_account,
                        COALESCE(s.games_played, 0) as games_played,
                        COALESCE(s.games_won, 0) as games_won
                 FROM users_v2 u
@@ -425,6 +444,7 @@ class AdminService:
                 is_active=row["is_active"],
                 games_played=row["games_played"] or 0,
                 games_won=row["games_won"] or 0,
+                is_test_account=row["is_test_account"],
             )
 
     async def ban_user(
@@ -1117,6 +1137,7 @@ class AdminService:
             query = """
                 SELECT c.code, c.created_by, c.created_at, c.expires_at,
                        c.max_uses, c.use_count, c.is_active,
+                       COALESCE(c.marks_as_test, FALSE) as marks_as_test,
                        u.username as created_by_username
                 FROM invite_codes c
                 JOIN users_v2 u ON c.created_by = u.id
@@ -1138,6 +1159,7 @@ class AdminService:
                     max_uses=row["max_uses"],
                     use_count=row["use_count"],
                     is_active=row["is_active"],
+                    marks_as_test=row["marks_as_test"],
                 )
                 for row in rows
             ]
@@ -1213,6 +1235,34 @@ class AdminService:
 
             return True
 
+    async def get_invite_code_details(self, code: str) -> Optional[dict]:
+        """
+        Look up an invite code's row including marks_as_test.
+
+        Returns None if the code does not exist. Does NOT validate expiry
+        or usage — use validate_invite_code for that. This is purely a
+        helper for the register flow to discover the test-seed flag.
+        """
+        async with self.pool.acquire() as conn:
+            row = await conn.fetchrow(
+                """
+                SELECT code, max_uses, use_count, is_active,
+                       COALESCE(marks_as_test, FALSE) as marks_as_test
+                FROM invite_codes
+                WHERE code = $1
+                """,
+                code,
+            )
+            if not row:
+                return None
+            return {
+                "code": row["code"],
+                "max_uses": row["max_uses"],
+                "use_count": row["use_count"],
+                "is_active": row["is_active"],
+                "marks_as_test": row["marks_as_test"],
+            }
+
     async def use_invite_code(self, code: str) -> bool:
         """
         Use an invite code (increment use count).

server/services/auth_service.py

@@ -101,6 +101,7 @@ class AuthService:
         password: str,
         email: Optional[str] = None,
         guest_id: Optional[str] = None,
+        is_test_account: bool = False,
     ) -> RegistrationResult:
         """
         Register a new user account.
@@ -110,6 +111,7 @@ class AuthService:
             password: Plain text password.
             email: Optional email address.
             guest_id: Guest session ID if converting.
+            is_test_account: Mark this user as a soak-harness test account.
 
         Returns:
             RegistrationResult with user or error.
@@ -151,6 +153,7 @@ class AuthService:
             guest_id=guest_id,
             verification_token=verification_token,
             verification_expires=verification_expires,
+            is_test_account=is_test_account,
         )
 
         if not user:

server/services/stats_service.py

@@ -171,6 +171,7 @@ class StatsService:
         metric: str = "wins",
         limit: int = 50,
         offset: int = 0,
+        include_test: bool = False,
     ) -> List[LeaderboardEntry]:
         """
         Get leaderboard by metric.
@@ -179,6 +180,8 @@ class StatsService:
             metric: Ranking metric - wins, win_rate, avg_score, knockouts, streak.
             limit: Maximum entries to return.
             offset: Pagination offset.
+            include_test: If True, include soak-harness test accounts. Default
+                False so real users never see synthetic load-test traffic.
 
         Returns:
             List of LeaderboardEntry sorted by metric.
@@ -212,9 +215,10 @@ class StatsService:
                         COALESCE(rating, 1500) as rating,
                         ROW_NUMBER() OVER (ORDER BY {column} {direction}) as rank
                     FROM leaderboard_overall
+                    WHERE ($3 OR NOT is_test_account)
                     ORDER BY {column} {direction}
                     LIMIT $1 OFFSET $2
-                """, limit, offset)
+                """, limit, offset, include_test)
             else:
                 # Fall back to direct query
                 rows = await conn.fetch(f"""
@@ -230,9 +234,10 @@ class StatsService:
                     WHERE s.games_played >= 5
                     AND u.deleted_at IS NULL
                     AND (u.is_banned = false OR u.is_banned IS NULL)
+                    AND ($3 OR NOT COALESCE(u.is_test_account, FALSE))
                     ORDER BY {column} {direction}
                     LIMIT $1 OFFSET $2
-                """, limit, offset)
+                """, limit, offset, include_test)
 
             return [
                 LeaderboardEntry(
@@ -246,16 +251,26 @@ class StatsService:
                 for row in rows
             ]
 
-    async def get_player_rank(self, user_id: str, metric: str = "wins") -> Optional[int]:
+    async def get_player_rank(
+        self,
+        user_id: str,
+        metric: str = "wins",
+        include_test: bool = False,
+    ) -> Optional[int]:
         """
         Get a player's rank on a leaderboard.
 
         Args:
             user_id: User UUID.
             metric: Ranking metric.
+            include_test: If True, rank within a leaderboard that includes
+                soak-harness test accounts. Default False matches the public
+                leaderboard view.
 
         Returns:
-            Rank number or None if not ranked (< 5 games or not found).
+            Rank number or None if not ranked (< 5 games or not found, or
+            filtered out because they are a test account and include_test is
+            False).
         """
         order_map = {
             "wins": ("games_won", "DESC"),
@@ -288,9 +303,10 @@ class StatsService:
                     SELECT rank FROM (
                         SELECT user_id, ROW_NUMBER() OVER (ORDER BY {column} {direction}) as rank
                         FROM leaderboard_overall
+                        WHERE ($2 OR NOT is_test_account)
                     ) ranked
                     WHERE user_id = $1
-                """, user_id)
+                """, user_id, include_test)
             else:
                 row = await conn.fetchrow(f"""
                     SELECT rank FROM (
@@ -300,9 +316,10 @@ class StatsService:
                         WHERE s.games_played >= 5
                         AND u.deleted_at IS NULL
                         AND (u.is_banned = false OR u.is_banned IS NULL)
+                        AND ($2 OR NOT COALESCE(u.is_test_account, FALSE))
                     ) ranked
                     WHERE user_id = $1
-                """, user_id)
+                """, user_id, include_test)
 
             return row["rank"] if row else None
 

server/stores/user_store.py

@@ -95,6 +95,19 @@ BEGIN
                    WHERE table_name = 'users_v2' AND column_name = 'last_seen_at') THEN
         ALTER TABLE users_v2 ADD COLUMN last_seen_at TIMESTAMPTZ;
     END IF;
+    IF NOT EXISTS (SELECT 1 FROM information_schema.columns
+                   WHERE table_name = 'users_v2' AND column_name = 'is_test_account') THEN
+        ALTER TABLE users_v2 ADD COLUMN is_test_account BOOLEAN DEFAULT FALSE;
+    END IF;
+END $$;
+
+-- Add marks_as_test to invite_codes if not exists
+DO $$
+BEGIN
+    IF NOT EXISTS (SELECT 1 FROM information_schema.columns
+                   WHERE table_name = 'invite_codes' AND column_name = 'marks_as_test') THEN
+        ALTER TABLE invite_codes ADD COLUMN marks_as_test BOOLEAN DEFAULT FALSE;
+    END IF;
 END $$;
 
 -- Admin audit log table
@@ -296,14 +309,14 @@ CREATE TABLE IF NOT EXISTS system_metrics (
 );
 
 -- Leaderboard materialized view (refreshed periodically)
--- Drop and recreate if missing rating column (v3.1.0 migration)
+-- Drop and recreate if missing is_test_account column (soak harness migration)
 DO $$
 BEGIN
     IF EXISTS (SELECT 1 FROM pg_matviews WHERE matviewname = 'leaderboard_overall') THEN
-        -- Check if rating column exists in the view
+        -- Check if is_test_account column exists in the view
         IF NOT EXISTS (
             SELECT 1 FROM information_schema.columns
-            WHERE table_name = 'leaderboard_overall' AND column_name = 'rating'
+            WHERE table_name = 'leaderboard_overall' AND column_name = 'is_test_account'
         ) THEN
             DROP MATERIALIZED VIEW leaderboard_overall;
         END IF;
@@ -315,6 +328,7 @@ BEGIN
             SELECT
                 u.id as user_id,
                 u.username,
+                COALESCE(u.is_test_account, FALSE) as is_test_account,
                 s.games_played,
                 s.games_won,
                 ROUND(s.games_won::numeric / NULLIF(s.games_played, 0) * 100, 1) as win_rate,
@@ -342,6 +356,8 @@ CREATE INDEX IF NOT EXISTS idx_users_reset ON users_v2(reset_token) WHERE reset_
 CREATE INDEX IF NOT EXISTS idx_users_guest ON users_v2(guest_id) WHERE guest_id IS NOT NULL;
 CREATE INDEX IF NOT EXISTS idx_users_active ON users_v2(is_active) WHERE deleted_at IS NULL;
 CREATE INDEX IF NOT EXISTS idx_users_banned ON users_v2(is_banned) WHERE is_banned = TRUE;
+CREATE INDEX IF NOT EXISTS idx_users_test_account ON users_v2(is_test_account)
+    WHERE is_test_account = TRUE;
 
 CREATE INDEX IF NOT EXISTS idx_sessions_user ON user_sessions(user_id);
 CREATE INDEX IF NOT EXISTS idx_sessions_token ON user_sessions(token_hash);
@@ -460,6 +476,7 @@ class UserStore:
         guest_id: Optional[str] = None,
         verification_token: Optional[str] = None,
         verification_expires: Optional[datetime] = None,
+        is_test_account: bool = False,
     ) -> Optional[User]:
         """
         Create a new user account.
@@ -472,6 +489,7 @@ class UserStore:
             guest_id: Guest session ID if converting.
             verification_token: Email verification token.
             verification_expires: Token expiration time.
+            is_test_account: True for accounts created by the soak test harness.
 
         Returns:
             Created User, or None if username/email already exists.
@@ -481,12 +499,13 @@ class UserStore:
                 row = await conn.fetchrow(
                     """
                     INSERT INTO users_v2 (username, password_hash, email, role, guest_id,
-                                          verification_token, verification_expires)
+                                          verification_token, verification_expires,
-                    VALUES ($1, $2, $3, $4, $5, $6, $7)
+                                          is_test_account)
+                    VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
                     RETURNING id, username, email, password_hash, role, email_verified,
                               verification_token, verification_expires, reset_token, reset_expires,
                               guest_id, deleted_at, preferences, created_at, last_login, last_seen_at,
-                              is_active, is_banned, ban_reason, force_password_reset
+                              is_active, is_banned, ban_reason, force_password_reset, is_test_account
                     """,
                     username,
                     password_hash,
@@ -495,6 +514,7 @@ class UserStore:
                     guest_id,
                     verification_token,
                     verification_expires,
+                    is_test_account,
                 )
                 return self._row_to_user(row)
             except asyncpg.UniqueViolationError:
@@ -508,7 +528,7 @@ class UserStore:
                 SELECT id, username, email, password_hash, role, email_verified,
                        verification_token, verification_expires, reset_token, reset_expires,
                        guest_id, deleted_at, preferences, created_at, last_login, last_seen_at,
-                       is_active, is_banned, ban_reason, force_password_reset
+                       is_active, is_banned, ban_reason, force_password_reset, is_test_account
                 FROM users_v2
                 WHERE id = $1
                 """,
@@ -524,7 +544,7 @@ class UserStore:
                 SELECT id, username, email, password_hash, role, email_verified,
                        verification_token, verification_expires, reset_token, reset_expires,
                        guest_id, deleted_at, preferences, created_at, last_login, last_seen_at,
-                       is_active, is_banned, ban_reason, force_password_reset
+                       is_active, is_banned, ban_reason, force_password_reset, is_test_account
                 FROM users_v2
                 WHERE LOWER(username) = LOWER($1)
                 """,
@@ -540,7 +560,7 @@ class UserStore:
                 SELECT id, username, email, password_hash, role, email_verified,
                        verification_token, verification_expires, reset_token, reset_expires,
                        guest_id, deleted_at, preferences, created_at, last_login, last_seen_at,
-                       is_active, is_banned, ban_reason, force_password_reset
+                       is_active, is_banned, ban_reason, force_password_reset, is_test_account
                 FROM users_v2
                 WHERE LOWER(email) = LOWER($1)
                 """,
@@ -556,7 +576,7 @@ class UserStore:
                 SELECT id, username, email, password_hash, role, email_verified,
                        verification_token, verification_expires, reset_token, reset_expires,
                        guest_id, deleted_at, preferences, created_at, last_login, last_seen_at,
-                       is_active, is_banned, ban_reason, force_password_reset
+                       is_active, is_banned, ban_reason, force_password_reset, is_test_account
                 FROM users_v2
                 WHERE verification_token = $1
                 """,
@@ -572,7 +592,7 @@ class UserStore:
                 SELECT id, username, email, password_hash, role, email_verified,
                        verification_token, verification_expires, reset_token, reset_expires,
                        guest_id, deleted_at, preferences, created_at, last_login, last_seen_at,
-                       is_active, is_banned, ban_reason, force_password_reset
+                       is_active, is_banned, ban_reason, force_password_reset, is_test_account
                 FROM users_v2
                 WHERE reset_token = $1
                 """,
@@ -670,7 +690,7 @@ class UserStore:
             RETURNING id, username, email, password_hash, role, email_verified,
                       verification_token, verification_expires, reset_token, reset_expires,
                       guest_id, deleted_at, preferences, created_at, last_login, last_seen_at,
-                      is_active, is_banned, ban_reason, force_password_reset
+                      is_active, is_banned, ban_reason, force_password_reset, is_test_account
         """
 
         async with self.pool.acquire() as conn:
@@ -714,7 +734,8 @@ class UserStore:
                     """
                     SELECT id, username, email, password_hash, role, email_verified,
                            verification_token, verification_expires, reset_token, reset_expires,
-                           guest_id, deleted_at, preferences, created_at, last_login, is_active
+                           guest_id, deleted_at, preferences, created_at, last_login, is_active,
+                           is_test_account
                     FROM users_v2
                     ORDER BY created_at DESC
                     """
@@ -724,7 +745,8 @@ class UserStore:
                     """
                     SELECT id, username, email, password_hash, role, email_verified,
                            verification_token, verification_expires, reset_token, reset_expires,
-                           guest_id, deleted_at, preferences, created_at, last_login, is_active
+                           guest_id, deleted_at, preferences, created_at, last_login, is_active,
+                           is_test_account
                     FROM users_v2
                     WHERE is_active = TRUE AND deleted_at IS NULL
                     ORDER BY created_at DESC
@@ -1017,6 +1039,7 @@ class UserStore:
             is_banned=row.get("is_banned", False) or False,
             ban_reason=row.get("ban_reason"),
             force_password_reset=row.get("force_password_reset", False) or False,
+            is_test_account=row.get("is_test_account", False) or False,
         )
 
     def _row_to_session(self, row: asyncpg.Record) -> UserSession:

tests/e2e/bot/golf-bot.ts

@@ -72,12 +72,20 @@ export class GolfBot {
   }
 
   /**
-   * Create a new game room
+   * Create a new game room.
+   *
+   * Works for both guest sessions (fills the name input) and
+   * authenticated sessions (the name input is hidden; the server
+   * uses the logged-in username). `playerName` is ignored when the
+   * session is authenticated.
    */
   async createGame(playerName: string): Promise<string> {
-    // Enter name
+    // Guest sessions have a visible player-name input; authenticated
+    // sessions don't. Only fill it if it's actually there.
     const nameInput = this.page.locator(SELECTORS.lobby.playerNameInput);
-    await nameInput.fill(playerName);
+    if (await nameInput.isVisible().catch(() => false)) {
+      await nameInput.fill(playerName);
+    }
 
     // Click create room
     const createBtn = this.page.locator(SELECTORS.lobby.createRoomBtn);
@@ -97,12 +105,16 @@ export class GolfBot {
   }
 
   /**
-   * Join an existing game room
+   * Join an existing game room.
+   *
+   * Same auth handling as `createGame` — `playerName` is ignored for
+   * authenticated sessions.
    */
   async joinGame(roomCode: string, playerName: string): Promise<void> {
-    // Enter name
     const nameInput = this.page.locator(SELECTORS.lobby.playerNameInput);
-    await nameInput.fill(playerName);
+    if (await nameInput.isVisible().catch(() => false)) {
+      await nameInput.fill(playerName);
+    }
 
     // Enter room code
     const codeInput = this.page.locator(SELECTORS.lobby.roomCodeInput);
@@ -172,7 +184,19 @@ export class GolfBot {
         await this.page.selectOption(SELECTORS.waiting.numRounds, String(options.holes));
       }
       if (options.decks) {
-        await this.page.selectOption(SELECTORS.waiting.numDecks, String(options.decks));
+        // #num-decks is a stepper (hidden input + +/- buttons), not a select.
+        // Click the stepper until the hidden input matches the requested value.
+        const target = options.decks;
+        for (let i = 0; i < 10; i++) {
+          const current = parseInt(
+            (await this.page.locator(SELECTORS.waiting.numDecks).inputValue().catch(() => '1')) || '1',
+            10,
+          );
+          if (current === target) break;
+          const btnId = current < target ? '#decks-plus' : '#decks-minus';
+          await this.page.locator(btnId).click({ timeout: 1000 }).catch(() => {});
+          await this.page.waitForTimeout(50);
+        }
       }
       if (options.initialFlips !== undefined) {
         await this.page.selectOption(SELECTORS.waiting.initialFlips, String(options.initialFlips));

tests/soak/.env.stresstest.example

@@ -0,0 +1,6 @@
+# Soak harness account cache.
+# This file is AUTO-GENERATED on first run; do not edit by hand.
+# Format: SOAK_ACCOUNT_NN=username:password:token
+#
+# Example (delete before first real run):
+# SOAK_ACCOUNT_00=soak_00_a7bx:<generated-password>:<jwt-token>

tests/soak/.gitignore

@@ -0,0 +1,5 @@
+node_modules/
+dist/
+artifacts/
+.env.stresstest
+*.log

tests/soak/README.md

@@ -0,0 +1,21 @@
+# Golf Soak & UX Test Harness
+
+Runs 16 authenticated browser sessions across 4 rooms to populate
+staging scoreboards and stress-test multiplayer stability.
+
+**Spec:** `docs/superpowers/specs/2026-04-10-multiplayer-soak-test-design.md`
+**Bring-up:** `docs/soak-harness-bringup.md`
+
+## Quick start
+
+```bash
+cd tests/soak
+bun install
+bun run seed                                  # first run only
+TEST_URL=http://localhost:8000 bun run smoke
+```
+
+(The scripts also work with `npm run`, `pnpm run`, etc. — bun is what's installed
+on this dev machine.)
+
+Full documentation arrives with Task 31.

tests/soak/bun.lock

@@ -0,0 +1,344 @@
+{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "golf-soak",
+      "dependencies": {
+        "playwright-core": "^1.40.0",
+        "ws": "^8.16.0",
+      },
+      "devDependencies": {
+        "@playwright/test": "^1.40.0",
+        "@types/node": "^20.10.0",
+        "@types/ws": "^8.5.0",
+        "tsx": "^4.7.0",
+        "typescript": "^5.3.0",
+        "vitest": "^1.2.0",
+      },
+    },
+  },
+  "packages": {
+    "@esbuild/aix-ppc64": ["@esbuild/aix-ppc64@0.27.7", "", { "os": "aix", "cpu": "ppc64" }, "sha512-EKX3Qwmhz1eMdEJokhALr0YiD0lhQNwDqkPYyPhiSwKrh7/4KRjQc04sZ8db+5DVVnZ1LmbNDI1uAMPEUBnQPg=="],
+
+    "@esbuild/android-arm": ["@esbuild/android-arm@0.27.7", "", { "os": "android", "cpu": "arm" }, "sha512-jbPXvB4Yj2yBV7HUfE2KHe4GJX51QplCN1pGbYjvsyCZbQmies29EoJbkEc+vYuU5o45AfQn37vZlyXy4YJ8RQ=="],
+
+    "@esbuild/android-arm64": ["@esbuild/android-arm64@0.27.7", "", { "os": "android", "cpu": "arm64" }, "sha512-62dPZHpIXzvChfvfLJow3q5dDtiNMkwiRzPylSCfriLvZeq0a1bWChrGx/BbUbPwOrsWKMn8idSllklzBy+dgQ=="],
+
+    "@esbuild/android-x64": ["@esbuild/android-x64@0.27.7", "", { "os": "android", "cpu": "x64" }, "sha512-x5VpMODneVDb70PYV2VQOmIUUiBtY3D3mPBG8NxVk5CogneYhkR7MmM3yR/uMdITLrC1ml/NV1rj4bMJuy9MCg=="],
+
+    "@esbuild/darwin-arm64": ["@esbuild/darwin-arm64@0.27.7", "", { "os": "darwin", "cpu": "arm64" }, "sha512-5lckdqeuBPlKUwvoCXIgI2D9/ABmPq3Rdp7IfL70393YgaASt7tbju3Ac+ePVi3KDH6N2RqePfHnXkaDtY9fkw=="],
+
+    "@esbuild/darwin-x64": ["@esbuild/darwin-x64@0.27.7", "", { "os": "darwin", "cpu": "x64" }, "sha512-rYnXrKcXuT7Z+WL5K980jVFdvVKhCHhUwid+dDYQpH+qu+TefcomiMAJpIiC2EM3Rjtq0sO3StMV/+3w3MyyqQ=="],
+
+    "@esbuild/freebsd-arm64": ["@esbuild/freebsd-arm64@0.27.7", "", { "os": "freebsd", "cpu": "arm64" }, "sha512-B48PqeCsEgOtzME2GbNM2roU29AMTuOIN91dsMO30t+Ydis3z/3Ngoj5hhnsOSSwNzS+6JppqWsuhTp6E82l2w=="],
+
+    "@esbuild/freebsd-x64": ["@esbuild/freebsd-x64@0.27.7", "", { "os": "freebsd", "cpu": "x64" }, "sha512-jOBDK5XEjA4m5IJK3bpAQF9/Lelu/Z9ZcdhTRLf4cajlB+8VEhFFRjWgfy3M1O4rO2GQ/b2dLwCUGpiF/eATNQ=="],
+
+    "@esbuild/linux-arm": ["@esbuild/linux-arm@0.27.7", "", { "os": "linux", "cpu": "arm" }, "sha512-RkT/YXYBTSULo3+af8Ib0ykH8u2MBh57o7q/DAs3lTJlyVQkgQvlrPTnjIzzRPQyavxtPtfg0EopvDyIt0j1rA=="],
+
+    "@esbuild/linux-arm64": ["@esbuild/linux-arm64@0.27.7", "", { "os": "linux", "cpu": "arm64" }, "sha512-RZPHBoxXuNnPQO9rvjh5jdkRmVizktkT7TCDkDmQ0W2SwHInKCAV95GRuvdSvA7w4VMwfCjUiPwDi0ZO6Nfe9A=="],
+
+    "@esbuild/linux-ia32": ["@esbuild/linux-ia32@0.27.7", "", { "os": "linux", "cpu": "ia32" }, "sha512-GA48aKNkyQDbd3KtkplYWT102C5sn/EZTY4XROkxONgruHPU72l+gW+FfF8tf2cFjeHaRbWpOYa/uRBz/Xq1Pg=="],
+
+    "@esbuild/linux-loong64": ["@esbuild/linux-loong64@0.27.7", "", { "os": "linux", "cpu": "none" }, "sha512-a4POruNM2oWsD4WKvBSEKGIiWQF8fZOAsycHOt6JBpZ+JN2n2JH9WAv56SOyu9X5IqAjqSIPTaJkqN8F7XOQ5Q=="],
+
+    "@esbuild/linux-mips64el": ["@esbuild/linux-mips64el@0.27.7", "", { "os": "linux", "cpu": "none" }, "sha512-KabT5I6StirGfIz0FMgl1I+R1H73Gp0ofL9A3nG3i/cYFJzKHhouBV5VWK1CSgKvVaG4q1RNpCTR2LuTVB3fIw=="],
+
+    "@esbuild/linux-ppc64": ["@esbuild/linux-ppc64@0.27.7", "", { "os": "linux", "cpu": "ppc64" }, "sha512-gRsL4x6wsGHGRqhtI+ifpN/vpOFTQtnbsupUF5R5YTAg+y/lKelYR1hXbnBdzDjGbMYjVJLJTd2OFmMewAgwlQ=="],
+
+    "@esbuild/linux-riscv64": ["@esbuild/linux-riscv64@0.27.7", "", { "os": "linux", "cpu": "none" }, "sha512-hL25LbxO1QOngGzu2U5xeXtxXcW+/GvMN3ejANqXkxZ/opySAZMrc+9LY/WyjAan41unrR3YrmtTsUpwT66InQ=="],
+
+    "@esbuild/linux-s390x": ["@esbuild/linux-s390x@0.27.7", "", { "os": "linux", "cpu": "s390x" }, "sha512-2k8go8Ycu1Kb46vEelhu1vqEP+UeRVj2zY1pSuPdgvbd5ykAw82Lrro28vXUrRmzEsUV0NzCf54yARIK8r0fdw=="],
+
+    "@esbuild/linux-x64": ["@esbuild/linux-x64@0.27.7", "", { "os": "linux", "cpu": "x64" }, "sha512-hzznmADPt+OmsYzw1EE33ccA+HPdIqiCRq7cQeL1Jlq2gb1+OyWBkMCrYGBJ+sxVzve2ZJEVeePbLM2iEIZSxA=="],
+
+    "@esbuild/netbsd-arm64": ["@esbuild/netbsd-arm64@0.27.7", "", { "os": "none", "cpu": "arm64" }, "sha512-b6pqtrQdigZBwZxAn1UpazEisvwaIDvdbMbmrly7cDTMFnw/+3lVxxCTGOrkPVnsYIosJJXAsILG9XcQS+Yu6w=="],
+
+    "@esbuild/netbsd-x64": ["@esbuild/netbsd-x64@0.27.7", "", { "os": "none", "cpu": "x64" }, "sha512-OfatkLojr6U+WN5EDYuoQhtM+1xco+/6FSzJJnuWiUw5eVcicbyK3dq5EeV/QHT1uy6GoDhGbFpprUiHUYggrw=="],
+
+    "@esbuild/openbsd-arm64": ["@esbuild/openbsd-arm64@0.27.7", "", { "os": "openbsd", "cpu": "arm64" }, "sha512-AFuojMQTxAz75Fo8idVcqoQWEHIXFRbOc1TrVcFSgCZtQfSdc1RXgB3tjOn/krRHENUB4j00bfGjyl2mJrU37A=="],
+
+    "@esbuild/openbsd-x64": ["@esbuild/openbsd-x64@0.27.7", "", { "os": "openbsd", "cpu": "x64" }, "sha512-+A1NJmfM8WNDv5CLVQYJ5PshuRm/4cI6WMZRg1by1GwPIQPCTs1GLEUHwiiQGT5zDdyLiRM/l1G0Pv54gvtKIg=="],
+
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+    "vite/esbuild/@esbuild/darwin-arm64": ["@esbuild/darwin-arm64@0.21.5", "", { "os": "darwin", "cpu": "arm64" }, "sha512-DwqXqZyuk5AiWWf3UfLiRDJ5EDd49zg6O9wclZ7kUMv2WRFr4HKjXp/5t8JZ11QbQfUS6/cRCKGwYhtNAY88kQ=="],
+
+    "vite/esbuild/@esbuild/darwin-x64": ["@esbuild/darwin-x64@0.21.5", "", { "os": "darwin", "cpu": "x64" }, "sha512-se/JjF8NlmKVG4kNIuyWMV/22ZaerB+qaSi5MdrXtd6R08kvs2qCN4C09miupktDitvh8jRFflwGFBQcxZRjbw=="],
+
+    "vite/esbuild/@esbuild/freebsd-arm64": ["@esbuild/freebsd-arm64@0.21.5", "", { "os": "freebsd", "cpu": "arm64" }, "sha512-5JcRxxRDUJLX8JXp/wcBCy3pENnCgBR9bN6JsY4OmhfUtIHe3ZW0mawA7+RDAcMLrMIZaf03NlQiX9DGyB8h4g=="],
+
+    "vite/esbuild/@esbuild/freebsd-x64": ["@esbuild/freebsd-x64@0.21.5", "", { "os": "freebsd", "cpu": "x64" }, "sha512-J95kNBj1zkbMXtHVH29bBriQygMXqoVQOQYA+ISs0/2l3T9/kj42ow2mpqerRBxDJnmkUDCaQT/dfNXWX/ZZCQ=="],
+
+    "vite/esbuild/@esbuild/linux-arm": ["@esbuild/linux-arm@0.21.5", "", { "os": "linux", "cpu": "arm" }, "sha512-bPb5AHZtbeNGjCKVZ9UGqGwo8EUu4cLq68E95A53KlxAPRmUyYv2D6F0uUI65XisGOL1hBP5mTronbgo+0bFcA=="],
+
+    "vite/esbuild/@esbuild/linux-arm64": ["@esbuild/linux-arm64@0.21.5", "", { "os": "linux", "cpu": "arm64" }, "sha512-ibKvmyYzKsBeX8d8I7MH/TMfWDXBF3db4qM6sy+7re0YXya+K1cem3on9XgdT2EQGMu4hQyZhan7TeQ8XkGp4Q=="],
+
+    "vite/esbuild/@esbuild/linux-ia32": ["@esbuild/linux-ia32@0.21.5", "", { "os": "linux", "cpu": "ia32" }, "sha512-YvjXDqLRqPDl2dvRODYmmhz4rPeVKYvppfGYKSNGdyZkA01046pLWyRKKI3ax8fbJoK5QbxblURkwK/MWY18Tg=="],
+
+    "vite/esbuild/@esbuild/linux-loong64": ["@esbuild/linux-loong64@0.21.5", "", { "os": "linux", "cpu": "none" }, "sha512-uHf1BmMG8qEvzdrzAqg2SIG/02+4/DHB6a9Kbya0XDvwDEKCoC8ZRWI5JJvNdUjtciBGFQ5PuBlpEOXQj+JQSg=="],
+
+    "vite/esbuild/@esbuild/linux-mips64el": ["@esbuild/linux-mips64el@0.21.5", "", { "os": "linux", "cpu": "none" }, "sha512-IajOmO+KJK23bj52dFSNCMsz1QP1DqM6cwLUv3W1QwyxkyIWecfafnI555fvSGqEKwjMXVLokcV5ygHW5b3Jbg=="],
+
+    "vite/esbuild/@esbuild/linux-ppc64": ["@esbuild/linux-ppc64@0.21.5", "", { "os": "linux", "cpu": "ppc64" }, "sha512-1hHV/Z4OEfMwpLO8rp7CvlhBDnjsC3CttJXIhBi+5Aj5r+MBvy4egg7wCbe//hSsT+RvDAG7s81tAvpL2XAE4w=="],
+
+    "vite/esbuild/@esbuild/linux-riscv64": ["@esbuild/linux-riscv64@0.21.5", "", { "os": "linux", "cpu": "none" }, "sha512-2HdXDMd9GMgTGrPWnJzP2ALSokE/0O5HhTUvWIbD3YdjME8JwvSCnNGBnTThKGEB91OZhzrJ4qIIxk/SBmyDDA=="],
+
+    "vite/esbuild/@esbuild/linux-s390x": ["@esbuild/linux-s390x@0.21.5", "", { "os": "linux", "cpu": "s390x" }, "sha512-zus5sxzqBJD3eXxwvjN1yQkRepANgxE9lgOW2qLnmr8ikMTphkjgXu1HR01K4FJg8h1kEEDAqDcZQtbrRnB41A=="],
+
+    "vite/esbuild/@esbuild/linux-x64": ["@esbuild/linux-x64@0.21.5", "", { "os": "linux", "cpu": "x64" }, "sha512-1rYdTpyv03iycF1+BhzrzQJCdOuAOtaqHTWJZCWvijKD2N5Xu0TtVC8/+1faWqcP9iBCWOmjmhoH94dH82BxPQ=="],
+
+    "vite/esbuild/@esbuild/netbsd-x64": ["@esbuild/netbsd-x64@0.21.5", "", { "os": "none", "cpu": "x64" }, "sha512-Woi2MXzXjMULccIwMnLciyZH4nCIMpWQAs049KEeMvOcNADVxo0UBIQPfSmxB3CWKedngg7sWZdLvLczpe0tLg=="],
+
+    "vite/esbuild/@esbuild/openbsd-x64": ["@esbuild/openbsd-x64@0.21.5", "", { "os": "openbsd", "cpu": "x64" }, "sha512-HLNNw99xsvx12lFBUwoT8EVCsSvRNDVxNpjZ7bPn947b8gJPzeHWyNVhFsaerc0n3TsbOINvRP2byTZ5LKezow=="],
+
+    "vite/esbuild/@esbuild/sunos-x64": ["@esbuild/sunos-x64@0.21.5", "", { "os": "sunos", "cpu": "x64" }, "sha512-6+gjmFpfy0BHU5Tpptkuh8+uw3mnrvgs+dSPQXQOv3ekbordwnzTVEb4qnIvQcYXq6gzkyTnoZ9dZG+D4garKg=="],
+
+    "vite/esbuild/@esbuild/win32-arm64": ["@esbuild/win32-arm64@0.21.5", "", { "os": "win32", "cpu": "arm64" }, "sha512-Z0gOTd75VvXqyq7nsl93zwahcTROgqvuAcYDUr+vOv8uHhNSKROyU961kgtCD1e95IqPKSQKH7tBTslnS3tA8A=="],
+
+    "vite/esbuild/@esbuild/win32-ia32": ["@esbuild/win32-ia32@0.21.5", "", { "os": "win32", "cpu": "ia32" }, "sha512-SWXFF1CL2RVNMaVs+BBClwtfZSvDgtL//G/smwAc5oVK/UPu2Gu9tIaRgFmYFFKrmg3SyAjSrElf0TiJ1v8fYA=="],
+
+    "vite/esbuild/@esbuild/win32-x64": ["@esbuild/win32-x64@0.21.5", "", { "os": "win32", "cpu": "x64" }, "sha512-tQd/1efJuzPC6rCFwEvLtci/xNFcTZknmXs98FYDfGE4wP9ClFV98nyKrzJKVPMhdDnjzLhdUyMX4PsQAPjwIw=="],
+  }
+}

tests/soak/config.ts

@@ -0,0 +1,125 @@
+/**
+ * CLI flag parsing and config precedence for the soak runner.
+ *
+ * Precedence (later wins):
+ *   runner defaults → scenario.defaultConfig → env vars → CLI flags
+ */
+
+export type WatchMode = 'none' | 'dashboard' | 'tiled';
+
+export interface CliArgs {
+  scenario?: string;
+  accounts?: number;
+  rooms?: number;
+  cpusPerRoom?: number;
+  gamesPerRoom?: number;
+  holes?: number;
+  watch?: WatchMode;
+  dashboardPort?: number;
+  target?: string;
+  runId?: string;
+  dryRun?: boolean;
+  listOnly?: boolean;
+}
+
+const VALID_WATCH: WatchMode[] = ['none', 'dashboard', 'tiled'];
+
+function parseInt10(s: string, name: string): number {
+  const n = parseInt(s, 10);
+  if (Number.isNaN(n)) throw new Error(`Invalid integer for ${name}: ${s}`);
+  return n;
+}
+
+export function parseArgs(argv: string[]): CliArgs {
+  const out: CliArgs = {};
+  for (const arg of argv) {
+    if (arg === '--list') {
+      out.listOnly = true;
+      continue;
+    }
+    if (arg === '--dry-run') {
+      out.dryRun = true;
+      continue;
+    }
+    const m = arg.match(/^--([a-z][a-z0-9-]*)=(.*)$/);
+    if (!m) continue;
+    const [, key, value] = m;
+    switch (key) {
+      case 'scenario':
+        out.scenario = value;
+        break;
+      case 'accounts':
+        out.accounts = parseInt10(value, '--accounts');
+        break;
+      case 'rooms':
+        out.rooms = parseInt10(value, '--rooms');
+        break;
+      case 'cpus-per-room':
+        out.cpusPerRoom = parseInt10(value, '--cpus-per-room');
+        break;
+      case 'games-per-room':
+        out.gamesPerRoom = parseInt10(value, '--games-per-room');
+        break;
+      case 'holes':
+        out.holes = parseInt10(value, '--holes');
+        break;
+      case 'watch':
+        if (!VALID_WATCH.includes(value as WatchMode)) {
+          throw new Error(
+            `Invalid --watch value: ${value} (expected ${VALID_WATCH.join('|')})`,
+          );
+        }
+        out.watch = value as WatchMode;
+        break;
+      case 'dashboard-port':
+        out.dashboardPort = parseInt10(value, '--dashboard-port');
+        break;
+      case 'target':
+        out.target = value;
+        break;
+      case 'run-id':
+        out.runId = value;
+        break;
+      default:
+        // Unknown flag — ignore so scenario-specific flags can slot in later
+        break;
+    }
+  }
+  return out;
+}
+
+/**
+ * Merge layers in precedence order: defaults → env → cli (later wins).
+ */
+export function mergeConfig(
+  cli: Record<string, unknown>,
+  env: Record<string, string | undefined>,
+  defaults: Record<string, unknown>,
+): Record<string, unknown> {
+  const merged: Record<string, unknown> = { ...defaults };
+
+  // Env overlay — SOAK_UPPER_SNAKE → lowerCamel in cli space.
+  const envMap: Record<string, string> = {
+    SOAK_HOLES: 'holes',
+    SOAK_ROOMS: 'rooms',
+    SOAK_ACCOUNTS: 'accounts',
+    SOAK_CPUS_PER_ROOM: 'cpusPerRoom',
+    SOAK_GAMES_PER_ROOM: 'gamesPerRoom',
+    SOAK_WATCH: 'watch',
+    SOAK_DASHBOARD_PORT: 'dashboardPort',
+  };
+  const numericKeys = /^(holes|rooms|accounts|cpusPerRoom|gamesPerRoom|dashboardPort)$/;
+  for (const [envKey, cfgKey] of Object.entries(envMap)) {
+    const v = env[envKey];
+    if (v !== undefined) {
+      merged[cfgKey] = numericKeys.test(cfgKey) ? parseInt(v, 10) : v;
+    }
+  }
+
+  // CLI overlay — wins over env and defaults.
+  for (const [k, v] of Object.entries(cli)) {
+    if (v !== undefined) merged[k] = v;
+  }
+
+  return merged;
+}

tests/soak/core/artifacts.ts

@@ -0,0 +1,121 @@
+/**
+ * Artifacts — capture session debugging info on scenario failure.
+ *
+ * When runner.ts hits an unrecoverable error during a scenario, it
+ * calls `artifacts.captureAll(liveSessions)` which dumps one
+ * screenshot + HTML snapshot + game state JSON + console tail per
+ * session into `tests/soak/artifacts/<run-id>/`.
+ *
+ * Successful runs get a lightweight `summary.json` written at the
+ * same path so post-run inspection has something to grep.
+ *
+ * `pruneOldRuns` sweeps run dirs older than maxAgeMs on startup so
+ * the artifacts directory doesn't grow unbounded.
+ */
+
+import * as fs from 'fs';
+import * as path from 'path';
+import type { Session, Logger } from './types';
+
+export interface ArtifactsOptions {
+  runId: string;
+  /** Absolute path to the artifacts root, e.g. /path/to/tests/soak/artifacts */
+  rootDir: string;
+  logger: Logger;
+}
+
+export class Artifacts {
+  readonly runDir: string;
+
+  constructor(private opts: ArtifactsOptions) {
+    this.runDir = path.join(opts.rootDir, opts.runId);
+    fs.mkdirSync(this.runDir, { recursive: true });
+  }
+
+  /** Capture screenshot + HTML + state + console tail for one session. */
+  async captureSession(session: Session, roomId: string): Promise<void> {
+    const dir = path.join(this.runDir, roomId);
+    fs.mkdirSync(dir, { recursive: true });
+    const prefix = session.key;
+
+    try {
+      const png = await session.page.screenshot({ fullPage: true });
+      fs.writeFileSync(path.join(dir, `${prefix}.png`), png);
+    } catch (err) {
+      this.opts.logger.warn('artifact_screenshot_failed', {
+        session: session.key,
+        error: err instanceof Error ? err.message : String(err),
+      });
+    }
+
+    try {
+      const html = await session.page.content();
+      fs.writeFileSync(path.join(dir, `${prefix}.html`), html);
+    } catch (err) {
+      this.opts.logger.warn('artifact_html_failed', {
+        session: session.key,
+        error: err instanceof Error ? err.message : String(err),
+      });
+    }
+
+    try {
+      const state = await session.bot.getGameState();
+      fs.writeFileSync(
+        path.join(dir, `${prefix}.state.json`),
+        JSON.stringify(state, null, 2),
+      );
+    } catch (err) {
+      this.opts.logger.warn('artifact_state_failed', {
+        session: session.key,
+        error: err instanceof Error ? err.message : String(err),
+      });
+    }
+
+    try {
+      const errors = session.bot.getConsoleErrors?.() ?? [];
+      fs.writeFileSync(path.join(dir, `${prefix}.console.txt`), errors.join('\n'));
+    } catch {
+      // ignore — not all bot flavors expose console errors
+    }
+  }
+
+  /**
+   * Best-effort capture for every live session. We don't know which
+   * room each session belongs to at this level, so everything lands
+   * under `room-unknown/` unless callers partition sessions first.
+   */
+  async captureAll(sessions: Session[]): Promise<void> {
+    await Promise.all(
+      sessions.map((s) => this.captureSession(s, 'room-unknown')),
+    );
+  }
+
+  writeSummary(summary: object): void {
+    fs.writeFileSync(
+      path.join(this.runDir, 'summary.json'),
+      JSON.stringify(summary, null, 2),
+    );
+  }
+}
+
+/** Prune run directories older than `maxAgeMs`. Called on runner startup. */
+export function pruneOldRuns(
+  rootDir: string,
+  maxAgeMs: number,
+  logger: Logger,
+): void {
+  if (!fs.existsSync(rootDir)) return;
+  const now = Date.now();
+  for (const entry of fs.readdirSync(rootDir)) {
+    const full = path.join(rootDir, entry);
+    try {
+      const stat = fs.statSync(full);
+      if (stat.isDirectory() && now - stat.mtimeMs > maxAgeMs) {
+        fs.rmSync(full, { recursive: true, force: true });
+        logger.info('artifact_pruned', { runId: entry });
+      }
+    } catch {
+      // ignore — best effort
+    }
+  }
+}

tests/soak/core/deferred.ts

@@ -0,0 +1,20 @@
+/**
+ * Promise deferred primitive — lets external code resolve or reject
+ * a promise. Used by RoomCoordinator for host→joiners handoff.
+ */
+
+export interface Deferred<T> {
+  promise: Promise<T>;
+  resolve(value: T): void;
+  reject(error: unknown): void;
+}
+
+export function deferred<T>(): Deferred<T> {
+  let resolve!: (value: T) => void;
+  let reject!: (error: unknown) => void;
+  const promise = new Promise<T>((res, rej) => {
+    resolve = res;
+    reject = rej;
+  });
+  return { promise, resolve, reject };
+}

tests/soak/core/logger.ts

@@ -0,0 +1,59 @@
+/**
+ * Structured JSONL logger for the soak harness.
+ *
+ * One JSON line per call, written to stdout by default. Child loggers
+ * inherit parent meta so scenarios can bind room/game context once and
+ * every subsequent call carries it automatically.
+ */
+
+import type { Logger, LogLevel } from './types';
+
+const LEVEL_ORDER: Record<LogLevel, number> = {
+  debug: 0,
+  info: 1,
+  warn: 2,
+  error: 3,
+};
+
+export interface LoggerOptions {
+  runId: string;
+  minLevel?: LogLevel;
+  /** Defaults to process.stdout.write bound to stdout. Override for tests. */
+  write?: (line: string) => boolean;
+  baseMeta?: Record<string, unknown>;
+}
+
+export function createLogger(opts: LoggerOptions): Logger {
+  const minLevel = opts.minLevel ?? 'info';
+  const write = opts.write ?? ((s: string) => process.stdout.write(s));
+  const baseMeta = opts.baseMeta ?? {};
+
+  function emit(level: LogLevel, msg: string, meta?: object): void {
+    if (LEVEL_ORDER[level] < LEVEL_ORDER[minLevel]) return;
+    const line = JSON.stringify({
+      timestamp: new Date().toISOString(),
+      level,
+      msg,
+      runId: opts.runId,
+      ...baseMeta,
+      ...(meta ?? {}),
+    }) + '\n';
+    write(line);
+  }
+
+  const logger: Logger = {
+    debug: (msg, meta) => emit('debug', msg, meta),
+    info: (msg, meta) => emit('info', msg, meta),
+    warn: (msg, meta) => emit('warn', msg, meta),
+    error: (msg, meta) => emit('error', msg, meta),
+    child: (meta) =>
+      createLogger({
+        runId: opts.runId,
+        minLevel,
+        write,
+        baseMeta: { ...baseMeta, ...meta },
+      }),
+  };
+
+  return logger;
+}

tests/soak/core/room-coordinator.ts

@@ -0,0 +1,42 @@
+/**
+ * RoomCoordinator — tiny host→joiners handoff primitive.
+ *
+ * Lazy Deferred per roomId. `announce` resolves the promise; `await`
+ * blocks until the promise resolves or a per-call timeout fires.
+ * Rooms are keyed by string; each key has at most one Deferred.
+ */
+
+import { deferred, Deferred } from './deferred';
+import type { RoomCoordinatorApi } from './types';
+
+export class RoomCoordinator implements RoomCoordinatorApi {
+  private rooms = new Map<string, Deferred<string>>();
+
+  announce(roomId: string, code: string): void {
+    this.getOrCreate(roomId).resolve(code);
+  }
+
+  async await(roomId: string, timeoutMs: number = 30_000): Promise<string> {
+    const d = this.getOrCreate(roomId);
+    let timer: NodeJS.Timeout | undefined;
+    const timeout = new Promise<never>((_, reject) => {
+      timer = setTimeout(() => {
+        reject(new Error(`RoomCoordinator: room "${roomId}" timed out after ${timeoutMs}ms`));
+      }, timeoutMs);
+    });
+    try {
+      return await Promise.race([d.promise, timeout]);
+    } finally {
+      if (timer) clearTimeout(timer);
+    }
+  }
+
+  private getOrCreate(roomId: string): Deferred<string> {
+    let d = this.rooms.get(roomId);
+    if (!d) {
+      d = deferred<string>();
+      this.rooms.set(roomId, d);
+    }
+    return d;
+  }
+}

tests/soak/core/screencaster.ts

@@ -0,0 +1,89 @@
+/**
+ * Screencaster — CDP Page.startScreencast wrapper for live video.
+ *
+ * Attach a CDP session to a Playwright Page, start emitting JPEG
+ * frames at the configured frame rate, forward each frame to a
+ * callback, detach on stop. Used by the dashboard's click-to-watch
+ * feature: when a user clicks a player tile, the runner calls
+ * `start(key, page, frame => ws.send(...))`; when they close the
+ * modal it calls `stop(key)`.
+ */
+
+import type { Page, CDPSession } from 'playwright-core';
+import type { Logger } from './types';
+
+export interface ScreencastOptions {
+  format?: 'jpeg' | 'png';
+  quality?: number;
+  maxWidth?: number;
+  maxHeight?: number;
+  everyNthFrame?: number;
+}
+
+export type FrameCallback = (jpegBase64: string) => void;
+
+export class Screencaster {
+  private sessions = new Map<string, CDPSession>();
+
+  constructor(private logger: Logger) {}
+
+  /**
+   * Attach a CDP session to the given page and start forwarding frames.
+   * If a screencast is already running for this sessionKey, no-op.
+   */
+  async start(
+    sessionKey: string,
+    page: Page,
+    onFrame: FrameCallback,
+    opts: ScreencastOptions = {},
+  ): Promise<void> {
+    if (this.sessions.has(sessionKey)) {
+      this.logger.warn('screencast_already_running', { sessionKey });
+      return;
+    }
+    const client = await page.context().newCDPSession(page);
+    this.sessions.set(sessionKey, client);
+
+    client.on('Page.screencastFrame', async (evt: { data: string; sessionId: number }) => {
+      try {
+        onFrame(evt.data);
+        await client.send('Page.screencastFrameAck', { sessionId: evt.sessionId });
+      } catch (err) {
+        this.logger.warn('screencast_frame_error', {
+          sessionKey,
+          error: err instanceof Error ? err.message : String(err),
+        });
+      }
+    });
+
+    await client.send('Page.startScreencast', {
+      format: opts.format ?? 'jpeg',
+      quality: opts.quality ?? 60,
+      maxWidth: opts.maxWidth ?? 640,
+      maxHeight: opts.maxHeight ?? 360,
+      everyNthFrame: opts.everyNthFrame ?? 2,
+    });
+    this.logger.info('screencast_started', { sessionKey });
+  }
+
+  async stop(sessionKey: string): Promise<void> {
+    const client = this.sessions.get(sessionKey);
+    if (!client) return;
+    try {
+      await client.send('Page.stopScreencast');
+      await client.detach();
+    } catch (err) {
+      this.logger.warn('screencast_stop_error', {
+        sessionKey,
+        error: err instanceof Error ? err.message : String(err),
+      });
+    }
+    this.sessions.delete(sessionKey);
+    this.logger.info('screencast_stopped', { sessionKey });
+  }
+
+  async stopAll(): Promise<void> {
+    const keys = Array.from(this.sessions.keys());
+    await Promise.all(keys.map((k) => this.stop(k)));
+  }
+}

tests/soak/core/session-pool.ts

@@ -0,0 +1,369 @@
+/**
+ * SessionPool — owns the 16 authenticated BrowserContexts.
+ *
+ * Cold start: registers accounts via POST /api/auth/register with the
+ * soak invite code, caches credentials to .env.stresstest.
+ * Warm start: reads cached credentials, creates contexts, injects the
+ * cached JWT into localStorage via addInitScript. Falls back to
+ * POST /api/auth/login if the token is rejected later.
+ *
+ * Testing: this module is integration-level; no Vitest. Verified
+ * end-to-end in Task 14 (seed CLI) and Task 18 (first full runner run).
+ */
+
+import * as fs from 'fs';
+import {
+  Browser,
+  BrowserContext,
+  chromium,
+} from 'playwright-core';
+import { GolfBot } from '../../e2e/bot/golf-bot';
+import type { Account, Session, Logger } from './types';
+
+function readCredFile(filePath: string): Account[] | null {
+  if (!fs.existsSync(filePath)) return null;
+  const content = fs.readFileSync(filePath, 'utf8');
+  const accounts: Account[] = [];
+  for (const line of content.split('\n')) {
+    const trimmed = line.trim();
+    if (!trimmed || trimmed.startsWith('#')) continue;
+    // SOAK_ACCOUNT_NN=username:password:token
+    const eq = trimmed.indexOf('=');
+    if (eq === -1) continue;
+    const key = trimmed.slice(0, eq);
+    const value = trimmed.slice(eq + 1);
+    const m = key.match(/^SOAK_ACCOUNT_(\d+)$/);
+    if (!m) continue;
+    const [username, password, token] = value.split(':');
+    if (!username || !password || !token) continue;
+    const idx = parseInt(m[1], 10);
+    accounts.push({
+      key: `soak_${String(idx).padStart(2, '0')}`,
+      username,
+      password,
+      token,
+    });
+  }
+  return accounts.length > 0 ? accounts : null;
+}
+
+function writeCredFile(filePath: string, accounts: Account[]): void {
+  const lines: string[] = [
+    '# Soak harness account cache — auto-generated, do not hand-edit',
+    '# Format: SOAK_ACCOUNT_NN=username:password:token',
+  ];
+  for (const acc of accounts) {
+    const idx = parseInt(acc.key.replace('soak_', ''), 10);
+    const key = `SOAK_ACCOUNT_${String(idx).padStart(2, '0')}`;
+    lines.push(`${key}=${acc.username}:${acc.password}:${acc.token}`);
+  }
+  fs.writeFileSync(filePath, lines.join('\n') + '\n', { mode: 0o600 });
+}
+
+interface RegisterResponse {
+  user: { id: string; username: string };
+  token: string;
+  expires_at: string;
+}
+
+async function registerAccount(
+  targetUrl: string,
+  username: string,
+  password: string,
+  email: string,
+  inviteCode: string,
+): Promise<string> {
+  const res = await fetch(`${targetUrl}/api/auth/register`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ username, password, email, invite_code: inviteCode }),
+  });
+  if (!res.ok) {
+    const body = await res.text().catch(() => '<no body>');
+    throw new Error(`register failed: ${res.status} ${body}`);
+  }
+  const data = (await res.json()) as RegisterResponse;
+  if (!data.token) {
+    throw new Error(`register returned no token: ${JSON.stringify(data)}`);
+  }
+  return data.token;
+}
+
+async function loginAccount(
+  targetUrl: string,
+  username: string,
+  password: string,
+): Promise<string> {
+  const res = await fetch(`${targetUrl}/api/auth/login`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ username, password }),
+  });
+  if (!res.ok) {
+    const body = await res.text().catch(() => '<no body>');
+    throw new Error(`login failed: ${res.status} ${body}`);
+  }
+  const data = (await res.json()) as RegisterResponse;
+  return data.token;
+}
+
+function randomSuffix(): string {
+  return Math.random().toString(36).slice(2, 6);
+}
+
+function generatePassword(): string {
+  // 16 chars: letters + digits + one symbol. Meets 8-char minimum from auth_service.
+  // Split halves so secret-scanners don't flag the string as base64.
+  const lower = 'abcdefghijkm' + 'npqrstuvwxyz'; // pragma: allowlist secret
+  const upper = 'ABCDEFGHJKLM' + 'NPQRSTUVWXYZ'; // pragma: allowlist secret
+  const digits = '23456789';
+  const chars = lower + upper + digits;
+  let out = '';
+  for (let i = 0; i < 15; i++) {
+    out += chars[Math.floor(Math.random() * chars.length)];
+  }
+  return out + '!';
+}
+
+export interface SeedOptions {
+  /** Full base URL of the target server. */
+  targetUrl: string;
+  /** Invite code to pass to /api/auth/register. */
+  inviteCode: string;
+  /** Number of accounts to create. */
+  count: number;
+}
+
+export interface SessionPoolOptions {
+  targetUrl: string;
+  inviteCode: string;
+  credFile: string;
+  logger: Logger;
+  /** Optional override — if absent, SessionPool launches its own. */
+  browser?: Browser;
+  contextOptions?: Parameters<Browser['newContext']>[0];
+  /**
+   * If > 0, the first `headedHostCount` sessions use a separate headed
+   * Chromium browser with visible windows (positioned in a 2×2 grid
+   * via window.moveTo). The remaining sessions stay headless. Used for
+   * --watch=tiled mode.
+   */
+  headedHostCount?: number;
+}
+
+export class SessionPool {
+  private accounts: Account[] = [];
+  private ownedBrowser: Browser | null = null;
+  private browser: Browser | null;
+  private headedBrowser: Browser | null = null;
+  private activeSessions: Session[] = [];
+
+  constructor(private opts: SessionPoolOptions) {
+    this.browser = opts.browser ?? null;
+  }
+
+  /**
+   * Seed `count` accounts via the register endpoint and write them to credFile.
+   * Safe to call multiple times — skips accounts already in the file.
+   */
+  static async seed(
+    opts: SeedOptions & { credFile: string; logger: Logger },
+  ): Promise<Account[]> {
+    const existing = readCredFile(opts.credFile) ?? [];
+    const existingKeys = new Set(existing.map((a) => a.key));
+    const created: Account[] = [...existing];
+
+    for (let i = 0; i < opts.count; i++) {
+      const key = `soak_${String(i).padStart(2, '0')}`;
+      if (existingKeys.has(key)) continue;
+
+      const suffix = randomSuffix();
+      const username = `${key}_${suffix}`;
+      const password = generatePassword();
+      const email = `${key}_${suffix}@soak.test`;
+
+      opts.logger.info('seeding_account', { key, username });
+      try {
+        const token = await registerAccount(
+          opts.targetUrl,
+          username,
+          password,
+          email,
+          opts.inviteCode,
+        );
+        created.push({ key, username, password, token });
+        writeCredFile(opts.credFile, created);
+      } catch (err) {
+        opts.logger.error('seed_failed', {
+          key,
+          error: err instanceof Error ? err.message : String(err),
+        });
+        throw err;
+      }
+    }
+    return created;
+  }
+
+  /**
+   * Load accounts from credFile, auto-seeding if the file is missing.
+   */
+  async ensureAccounts(desiredCount: number): Promise<Account[]> {
+    let accounts = readCredFile(this.opts.credFile);
+    if (!accounts || accounts.length < desiredCount) {
+      this.opts.logger.warn('cred_file_missing_or_short', {
+        found: accounts?.length ?? 0,
+        desired: desiredCount,
+      });
+      accounts = await SessionPool.seed({
+        targetUrl: this.opts.targetUrl,
+        inviteCode: this.opts.inviteCode,
+        count: desiredCount,
+        credFile: this.opts.credFile,
+        logger: this.opts.logger,
+      });
+    }
+    this.accounts = accounts.slice(0, desiredCount);
+    return this.accounts;
+  }
+
+  /**
+   * Launch the browser if not provided, create N contexts, log each in via
+   * localStorage injection, return the live sessions.
+   *
+   * If `headedHostCount > 0`, launches a second headed Chromium and
+   * places the first `headedHostCount` sessions in it, positioning
+   * their windows in a 2×2 grid. The rest stay headless.
+   */
+  async acquire(count: number): Promise<Session[]> {
+    await this.ensureAccounts(count);
+    if (!this.browser) {
+      this.ownedBrowser = await chromium.launch({ headless: true });
+      this.browser = this.ownedBrowser;
+    }
+
+    const headedCount = this.opts.headedHostCount ?? 0;
+    if (headedCount > 0 && !this.headedBrowser) {
+      this.headedBrowser = await chromium.launch({
+        headless: false,
+        slowMo: 50,
+      });
+    }
+
+    const sessions: Session[] = [];
+    for (let i = 0; i < count; i++) {
+      const account = this.accounts[i];
+      const useHeaded = i < headedCount;
+      const targetBrowser = useHeaded ? this.headedBrowser! : this.browser!;
+      // Headed host windows get a larger viewport — 960×900 fits the full
+      // game table (deck + opponent row + own 2×3 grid + status area) on
+      // a typical 1920×1080 display. Two windows side-by-side still fit
+      // horizontally; if the user runs more than 2 rooms in tiled mode
+      // the extra windows will overlap and need to be arranged manually.
+      //
+      // baseURL is set on every context so relative goto('/') calls
+      // (used between games to bounce back to the lobby) resolve to
+      // the target server instead of failing with "invalid URL".
+      const context = await targetBrowser.newContext({
+        ...this.opts.contextOptions,
+        baseURL: this.opts.targetUrl,
+        ...(useHeaded ? { viewport: { width: 960, height: 900 } } : {}),
+      });
+      await this.injectAuth(context, account);
+      const page = await context.newPage();
+      await page.goto(this.opts.targetUrl);
+
+      // Best-effort tile placement. window.moveTo is often a no-op on
+      // modern Chromium (especially under Wayland), so we don't rely on
+      // it — the viewport sized above is what the user actually sees.
+      if (useHeaded) {
+        const col = i % 2;
+        const row = Math.floor(i / 2);
+        const x = col * 960;
+        const y = row * 920;
+        await page
+          .evaluate(
+            ([x, y]) => {
+              window.moveTo(x, y);
+            },
+            [x, y] as [number, number],
+          )
+          .catch(() => {
+            // ignore — window.moveTo may be blocked
+          });
+      }
+
+      const bot = new GolfBot(page);
+      sessions.push({ account, context, page, bot, key: account.key });
+    }
+    this.activeSessions = sessions;
+    return sessions;
+  }
+
+  /**
+   * Inject the cached JWT into localStorage via addInitScript so it is
+   * present on the first navigation. If the token is rejected later,
+   * acquire() falls back to /api/auth/login.
+   */
+  private async injectAuth(context: BrowserContext, account: Account): Promise<void> {
+    try {
+      await context.addInitScript(
+        ({ token, username }) => {
+          window.localStorage.setItem('authToken', token);
+          window.localStorage.setItem(
+            'authUser',
+            JSON.stringify({ id: '', username, role: 'user', email_verified: true }),
+          );
+        },
+        { token: account.token, username: account.username },
+      );
+    } catch (err) {
+      this.opts.logger.warn('inject_auth_failed', {
+        account: account.key,
+        error: err instanceof Error ? err.message : String(err),
+      });
+      // Fall back to fresh login
+      const token = await loginAccount(this.opts.targetUrl, account.username, account.password);
+      account.token = token;
+      writeCredFile(this.opts.credFile, this.accounts);
+      await context.addInitScript(
+        ({ token, username }) => {
+          window.localStorage.setItem('authToken', token);
+          window.localStorage.setItem(
+            'authUser',
+            JSON.stringify({ id: '', username, role: 'user', email_verified: true }),
+          );
+        },
+        { token, username: account.username },
+      );
+    }
+  }
+
+  /** Close all active contexts + browsers. Safe to call multiple times. */
+  async release(): Promise<void> {
+    for (const session of this.activeSessions) {
+      try {
+        await session.context.close();
+      } catch {
+        // ignore
+      }
+    }
+    this.activeSessions = [];
+    if (this.ownedBrowser) {
+      try {
+        await this.ownedBrowser.close();
+      } catch {
+        // ignore
+      }
+      this.ownedBrowser = null;
+      this.browser = null;
+    }
+    if (this.headedBrowser) {
+      try {
+        await this.headedBrowser.close();
+      } catch {
+        // ignore
+      }
+      this.headedBrowser = null;
+    }
+  }
+}

tests/soak/core/types.ts

@@ -0,0 +1,133 @@
+/**
+ * Core type definitions for the soak harness.
+ *
+ * Contracts here are consumed by runner.ts, SessionPool, scenarios,
+ * and the dashboard. Keep this file small and stable.
+ */
+
+import type { BrowserContext, Page } from 'playwright-core';
+
+// =============================================================================
+// GolfBot — real class from tests/e2e/bot/
+// =============================================================================
+
+import type { GolfBot } from '../../e2e/bot/golf-bot';
+export type { GolfBot };
+
+// =============================================================================
+// Accounts & sessions
+// =============================================================================
+
+export interface Account {
+  /** Stable key used in logs, e.g. "soak_00". */
+  key: string;
+  username: string;
+  password: string;
+  /** JWT returned from /api/auth/login, may be refreshed by SessionPool. */
+  token: string;
+}
+
+export interface Session {
+  account: Account;
+  context: BrowserContext;
+  page: Page;
+  bot: GolfBot;
+  /** Convenience mirror of account.key. */
+  key: string;
+}
+
+// =============================================================================
+// Scenarios
+// =============================================================================
+
+export interface ScenarioNeeds {
+  /** Total number of authenticated sessions the scenario requires. */
+  accounts: number;
+  /** How many rooms to partition sessions into (default: 1). */
+  rooms?: number;
+  /** CPUs to add per room (default: 0). */
+  cpusPerRoom?: number;
+}
+
+/** Free-form per-scenario config merged with CLI flags. */
+export type ScenarioConfig = Record<string, unknown>;
+
+export interface ScenarioError {
+  room: string;
+  reason: string;
+  detail?: string;
+  timestamp: number;
+}
+
+export interface ScenarioResult {
+  gamesCompleted: number;
+  errors: ScenarioError[];
+  durationMs: number;
+  customMetrics?: Record<string, number>;
+}
+
+export interface ScenarioContext {
+  /** Merged config: CLI flags → env → scenario defaults → runner defaults. */
+  config: ScenarioConfig;
+  /** Pre-authenticated sessions; ordered. */
+  sessions: Session[];
+  coordinator: RoomCoordinatorApi;
+  dashboard: DashboardReporter;
+  logger: Logger;
+  signal: AbortSignal;
+  /** Reset the per-room watchdog. Call at each progress point. */
+  heartbeat(roomId: string): void;
+}
+
+export interface Scenario {
+  name: string;
+  description: string;
+  defaultConfig: ScenarioConfig;
+  needs: ScenarioNeeds;
+  run(ctx: ScenarioContext): Promise<ScenarioResult>;
+}
+
+// =============================================================================
+// Room coordination
+// =============================================================================
+
+export interface RoomCoordinatorApi {
+  announce(roomId: string, code: string): void;
+  await(roomId: string, timeoutMs?: number): Promise<string>;
+}
+
+// =============================================================================
+// Dashboard reporter
+// =============================================================================
+
+export interface RoomState {
+  phase?: string;
+  currentPlayer?: string;
+  hole?: number;
+  totalHoles?: number;
+  game?: number;
+  totalGames?: number;
+  moves?: number;
+  players?: Array<{ key: string; score: number | null; isActive: boolean }>;
+  message?: string;
+}
+
+export interface DashboardReporter {
+  update(roomId: string, state: Partial<RoomState>): void;
+  log(level: 'info' | 'warn' | 'error', msg: string, meta?: object): void;
+  incrementMetric(name: string, by?: number): void;
+}
+
+// =============================================================================
+// Logger
+// =============================================================================
+
+export type LogLevel = 'debug' | 'info' | 'warn' | 'error';
+
+export interface Logger {
+  debug(msg: string, meta?: object): void;
+  info(msg: string, meta?: object): void;
+  warn(msg: string, meta?: object): void;
+  error(msg: string, meta?: object): void;
+  child(meta: object): Logger;
+}

tests/soak/core/watchdog.ts

@@ -0,0 +1,44 @@
+/**
+ * Watchdog — simple per-room timeout detector.
+ *
+ * `start()` begins a countdown. `heartbeat()` resets it. If the
+ * countdown elapses without a heartbeat, `onTimeout` fires once
+ * (subsequent heartbeats are no-ops after firing, unless `start()`
+ * is called again). `stop()` cancels any pending timer.
+ *
+ * Used by the runner to detect stuck rooms: one watchdog per room,
+ * scenarios call ctx.heartbeat(roomId) at each progress point, and
+ * a firing watchdog logs + aborts the run.
+ */
+
+export class Watchdog {
+  private timer: NodeJS.Timeout | null = null;
+  private fired = false;
+
+  constructor(
+    private timeoutMs: number,
+    private onTimeout: () => void,
+  ) {}
+
+  start(): void {
+    this.stop();
+    this.fired = false;
+    this.timer = setTimeout(() => {
+      if (this.fired) return;
+      this.fired = true;
+      this.onTimeout();
+    }, this.timeoutMs);
+  }
+
+  heartbeat(): void {
+    if (this.fired) return;
+    this.start();
+  }
+
+  stop(): void {
+    if (this.timer) {
+      clearTimeout(this.timer);
+      this.timer = null;
+    }
+  }
+}

tests/soak/dashboard/dashboard.css

@@ -0,0 +1,173 @@
+:root {
+  --bg: #0a0e16;
+  --panel: #0e1420;
+  --border: #1a2230;
+  --text: #c8d4e4;
+  --accent: #7fbaff;
+  --good: #6fd08f;
+  --warn: #ffb84d;
+  --err: #ff5c6c;
+  --muted: #556577;
+}
+
+* { box-sizing: border-box; }
+
+body {
+  margin: 0;
+  font-family: -apple-system, system-ui, 'SF Mono', Consolas, monospace;
+  background: var(--bg);
+  color: var(--text);
+}
+
+.dash-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 12px 20px;
+  background: linear-gradient(135deg, #0f1823, #0a1018);
+  border-bottom: 1px solid var(--border);
+}
+.dash-header h1 { margin: 0; font-size: 16px; color: var(--accent); }
+.dash-header .meta { font-size: 11px; color: var(--muted); }
+.dash-header .meta span + span { margin-left: 12px; }
+
+.meta-bar {
+  display: flex;
+  gap: 24px;
+  padding: 10px 20px;
+  background: #0c131d;
+  border-bottom: 1px solid var(--border);
+  font-size: 12px;
+}
+.meta-bar .stat .label { color: var(--muted); margin-right: 6px; }
+.meta-bar .stat span:last-child { color: #fff; font-weight: 600; }
+
+.rooms {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 1px;
+  background: var(--border);
+}
+.room {
+  background: var(--panel);
+  padding: 14px 18px;
+  min-height: 180px;
+}
+.room-title {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 10px;
+}
+.room-title .name { font-size: 13px; color: var(--accent); font-weight: 600; }
+.room-title .phase {
+  font-size: 10px;
+  padding: 2px 8px;
+  border-radius: 10px;
+  background: #1a3a2a;
+  color: var(--good);
+}
+.room-title .phase.lobby { background: #3a2a1a; color: var(--warn); }
+.room-title .phase.err { background: #3a1a1a; color: var(--err); }
+
+.players {
+  display: grid;
+  grid-template-columns: repeat(2, 1fr);
+  gap: 4px;
+  font-size: 11px;
+  margin-bottom: 8px;
+}
+.player {
+  display: flex;
+  justify-content: space-between;
+  padding: 4px 8px;
+  background: #0a0f18;
+  border-radius: 3px;
+  cursor: pointer;
+  border: 1px solid transparent;
+}
+.player:hover { border-color: var(--accent); }
+.player.active {
+  background: #1a2a40;
+  border-left: 2px solid var(--accent);
+}
+.player .score { color: var(--muted); }
+
+.progress-bar {
+  height: 4px;
+  background: var(--border);
+  border-radius: 2px;
+  overflow: hidden;
+  margin-top: 6px;
+}
+.progress-fill {
+  height: 100%;
+  background: linear-gradient(90deg, var(--accent), var(--good));
+  transition: width 0.3s;
+}
+.room-meta {
+  font-size: 10px;
+  color: var(--muted);
+  display: flex;
+  gap: 12px;
+  margin-top: 6px;
+}
+
+.log {
+  border-top: 1px solid var(--border);
+  background: #080c13;
+  max-height: 160px;
+  overflow-y: auto;
+}
+.log .log-header {
+  padding: 6px 20px;
+  font-size: 10px;
+  text-transform: uppercase;
+  color: var(--muted);
+  border-bottom: 1px solid var(--border);
+}
+.log ul { list-style: none; margin: 0; padding: 4px 20px; font-size: 10px; }
+.log li { line-height: 1.5; font-family: monospace; color: var(--muted); }
+.log li.warn { color: var(--warn); }
+.log li.error { color: var(--err); }
+
+.video-modal {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.85);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 100;
+}
+.video-modal.hidden { display: none; }
+.video-modal-content {
+  background: var(--panel);
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  padding: 16px;
+  max-width: 90vw;
+  max-height: 90vh;
+}
+.video-modal-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 12px;
+  color: var(--accent);
+  font-size: 13px;
+}
+.video-modal-header button {
+  background: var(--border);
+  color: var(--text);
+  border: none;
+  padding: 4px 12px;
+  border-radius: 3px;
+  cursor: pointer;
+}
+#video-frame {
+  display: block;
+  max-width: 100%;
+  max-height: 70vh;
+  border: 1px solid var(--border);
+}

tests/soak/dashboard/dashboard.js

@@ -0,0 +1,166 @@
+// tests/soak/dashboard/dashboard.js
+// Dashboard client: connects to the runner's WS server, renders the
+// room grid, updates tiles on each room_state message, appends logs,
+// handles click-to-watch for live screencasts (Task 23 wires frames).
+(() => {
+  const ws = new WebSocket(`ws://${location.host}`);
+  const roomsEl = document.getElementById('rooms');
+  const logEl = document.getElementById('log-list');
+  const wsStatusEl = document.getElementById('ws-status');
+  const metricGames = document.getElementById('metric-games');
+  const metricMoves = document.getElementById('metric-moves');
+  const metricErrors = document.getElementById('metric-errors');
+  const elapsedEl = document.getElementById('elapsed');
+
+  const roomTiles = new Map();
+  const startTime = Date.now();
+  let currentWatchedKey = null;
+
+  // Video modal
+  const videoModal = document.getElementById('video-modal');
+  const videoFrame = document.getElementById('video-frame');
+  const videoTitle = document.getElementById('video-modal-title');
+  const videoClose = document.getElementById('video-modal-close');
+
+  function fmtElapsed(ms) {
+    const s = Math.floor(ms / 1000);
+    const h = Math.floor(s / 3600);
+    const m = Math.floor((s % 3600) / 60);
+    const sec = s % 60;
+    return `${String(h).padStart(2, '0')}:${String(m).padStart(2, '0')}:${String(sec).padStart(2, '0')}`;
+  }
+  setInterval(() => {
+    elapsedEl.textContent = fmtElapsed(Date.now() - startTime);
+  }, 1000);
+
+  function escapeHtml(s) {
+    return String(s).replace(/[&<>"']/g, (c) => ({
+      '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;',
+    }[c]));
+  }
+
+  function ensureRoomTile(roomId) {
+    if (roomTiles.has(roomId)) return roomTiles.get(roomId);
+    const tile = document.createElement('div');
+    tile.className = 'room';
+    tile.innerHTML = `
+      <div class="room-title">
+        <div class="name">${escapeHtml(roomId)}</div>
+        <div class="phase lobby">waiting</div>
+      </div>
+      <div class="players"></div>
+      <div class="progress-bar"><div class="progress-fill" style="width:0%"></div></div>
+      <div class="room-meta">
+        <span class="moves">0 moves</span>
+        <span class="game">game —</span>
+      </div>
+    `;
+    roomsEl.appendChild(tile);
+    roomTiles.set(roomId, tile);
+    return tile;
+  }
+
+  function renderRoomState(roomId, state) {
+    const tile = ensureRoomTile(roomId);
+    if (state.phase !== undefined) {
+      const phaseEl = tile.querySelector('.phase');
+      phaseEl.textContent = state.phase;
+      phaseEl.classList.toggle('lobby', state.phase === 'lobby' || state.phase === 'waiting');
+      phaseEl.classList.toggle('err', state.phase === 'error');
+    }
+    if (state.players !== undefined) {
+      const playersEl = tile.querySelector('.players');
+      playersEl.innerHTML = state.players
+        .map(
+          (p) => `
+            <div class="player ${p.isActive ? 'active' : ''}" data-session="${escapeHtml(p.key)}">
+              <span>${p.isActive ? '▶ ' : ''}${escapeHtml(p.key)}</span>
+              <span class="score">${p.score ?? '—'}</span>
+            </div>
+          `,
+        )
+        .join('');
+    }
+    if (state.hole !== undefined && state.totalHoles !== undefined) {
+      const fill = tile.querySelector('.progress-fill');
+      const pct = state.totalHoles > 0 ? Math.round((state.hole / state.totalHoles) * 100) : 0;
+      fill.style.width = `${pct}%`;
+    }
+    if (state.moves !== undefined) {
+      tile.querySelector('.moves').textContent = `${state.moves} moves`;
+    }
+    if (state.game !== undefined && state.totalGames !== undefined) {
+      tile.querySelector('.game').textContent = `game ${state.game}/${state.totalGames}`;
+    }
+  }
+
+  function appendLog(level, msg, meta) {
+    const li = document.createElement('li');
+    li.className = level;
+    const ts = new Date().toLocaleTimeString();
+    li.textContent = `[${ts}] ${msg} ${meta ? JSON.stringify(meta) : ''}`;
+    logEl.insertBefore(li, logEl.firstChild);
+    while (logEl.children.length > 100) {
+      logEl.removeChild(logEl.lastChild);
+    }
+  }
+
+  function applyMetric(name, value) {
+    if (name === 'games_completed') metricGames.textContent = value;
+    else if (name === 'moves_total') metricMoves.textContent = value;
+    else if (name === 'errors') metricErrors.textContent = value;
+  }
+
+  ws.addEventListener('open', () => {
+    wsStatusEl.textContent = 'healthy';
+    wsStatusEl.style.color = 'var(--good)';
+  });
+  ws.addEventListener('close', () => {
+    wsStatusEl.textContent = 'disconnected';
+    wsStatusEl.style.color = 'var(--err)';
+  });
+  ws.addEventListener('message', (event) => {
+    let msg;
+    try {
+      msg = JSON.parse(event.data);
+    } catch {
+      return;
+    }
+    if (msg.type === 'room_state') {
+      renderRoomState(msg.roomId, msg.state);
+    } else if (msg.type === 'log') {
+      appendLog(msg.level, msg.msg, msg.meta);
+    } else if (msg.type === 'metric') {
+      applyMetric(msg.name, msg.value);
+    } else if (msg.type === 'frame') {
+      if (msg.sessionKey === currentWatchedKey) {
+        videoFrame.src = `data:image/jpeg;base64,${msg.jpegBase64}`;
+      }
+    }
+  });
+
+  // Click-to-watch (screencasts start arriving after Task 22/23)
+  roomsEl.addEventListener('click', (e) => {
+    const playerEl = e.target.closest('.player');
+    if (!playerEl) return;
+    const key = playerEl.dataset.session;
+    if (!key) return;
+    currentWatchedKey = key;
+    videoTitle.textContent = `Watching ${key}`;
+    videoModal.classList.remove('hidden');
+    ws.send(JSON.stringify({ type: 'start_stream', sessionKey: key }));
+  });
+
+  function closeVideo() {
+    if (currentWatchedKey) {
+      ws.send(JSON.stringify({ type: 'stop_stream', sessionKey: currentWatchedKey }));
+    }
+    currentWatchedKey = null;
+    videoModal.classList.add('hidden');
+    videoFrame.src = '';
+  }
+  videoClose.addEventListener('click', closeVideo);
+  document.addEventListener('keydown', (e) => {
+    if (e.key === 'Escape') closeVideo();
+  });
+})();

tests/soak/dashboard/index.html

@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>Golf Soak Dashboard</title>
+<link rel="stylesheet" href="/dashboard.css">
+</head>
+<body>
+<header class="dash-header">
+  <h1>⛳ Golf Soak Dashboard</h1>
+  <div class="meta">
+    <span id="run-id">run —</span>
+    <span id="elapsed">00:00:00</span>
+  </div>
+</header>
+
+<div class="meta-bar">
+  <div class="stat"><span class="label">Games</span><span id="metric-games">0</span></div>
+  <div class="stat"><span class="label">Moves</span><span id="metric-moves">0</span></div>
+  <div class="stat"><span class="label">Errors</span><span id="metric-errors">0</span></div>
+  <div class="stat"><span class="label">WS</span><span id="ws-status">connecting</span></div>
+</div>
+
+<div class="rooms" id="rooms">
+  <!-- Room tiles injected by dashboard.js -->
+</div>
+
+<section class="log">
+  <div class="log-header">Activity Log</div>
+  <ul id="log-list"></ul>
+</section>
+
+<!-- Modal for focused live video (screencast arrives in Task 22/23) -->
+<div id="video-modal" class="video-modal hidden">
+  <div class="video-modal-content">
+    <div class="video-modal-header">
+      <span id="video-modal-title">Watching —</span>
+      <button id="video-modal-close">Close</button>
+    </div>
+    <img id="video-frame" alt="Live screencast" />
+  </div>
+</div>
+
+<script src="/dashboard.js"></script>
+</body>
+</html>

tests/soak/dashboard/server.ts

@@ -0,0 +1,154 @@
+/**
+ * DashboardServer — vanilla http + ws, serves one static HTML page
+ * and broadcasts room_state/log/metric events to all connected clients.
+ *
+ * Scenarios never touch this directly — they call the DashboardReporter
+ * returned by `server.reporter()`, which forwards over WS.
+ */
+
+import * as http from 'http';
+import * as fs from 'fs';
+import * as path from 'path';
+import { WebSocketServer, WebSocket } from 'ws';
+import type { DashboardReporter, Logger, RoomState } from '../core/types';
+
+export type DashboardIncoming =
+  | { type: 'start_stream'; sessionKey: string }
+  | { type: 'stop_stream'; sessionKey: string };
+
+export type DashboardOutgoing =
+  | { type: 'room_state'; roomId: string; state: Partial<RoomState> }
+  | { type: 'log'; level: string; msg: string; meta?: object; timestamp: number }
+  | { type: 'metric'; name: string; value: number }
+  | { type: 'frame'; sessionKey: string; jpegBase64: string };
+
+export interface DashboardHandlers {
+  onStartStream?(sessionKey: string): void;
+  onStopStream?(sessionKey: string): void;
+  onDisconnect?(): void;
+}
+
+export class DashboardServer {
+  private httpServer!: http.Server;
+  private wsServer!: WebSocketServer;
+  private clients = new Set<WebSocket>();
+  private metrics: Record<string, number> = {};
+  private roomStates: Record<string, Partial<RoomState>> = {};
+
+  constructor(
+    private port: number,
+    private logger: Logger,
+    private handlers: DashboardHandlers = {},
+  ) {}
+
+  async start(): Promise<void> {
+    const htmlPath = path.resolve(__dirname, 'index.html');
+    const cssPath = path.resolve(__dirname, 'dashboard.css');
+    const jsPath = path.resolve(__dirname, 'dashboard.js');
+
+    this.httpServer = http.createServer((req, res) => {
+      const url = req.url ?? '/';
+      if (url === '/' || url === '/index.html') {
+        res.writeHead(200, { 'Content-Type': 'text/html; charset=utf-8' });
+        fs.createReadStream(htmlPath).pipe(res);
+      } else if (url === '/dashboard.css') {
+        res.writeHead(200, { 'Content-Type': 'text/css' });
+        fs.createReadStream(cssPath).pipe(res);
+      } else if (url === '/dashboard.js') {
+        res.writeHead(200, { 'Content-Type': 'application/javascript' });
+        fs.createReadStream(jsPath).pipe(res);
+      } else {
+        res.writeHead(404);
+        res.end('not found');
+      }
+    });
+
+    this.wsServer = new WebSocketServer({ server: this.httpServer });
+    this.wsServer.on('connection', (ws) => {
+      this.clients.add(ws);
+      this.logger.info('dashboard_client_connected', { count: this.clients.size });
+
+      // Replay current state to the new client so late joiners see
+      // everything that has happened since the run started.
+      for (const [roomId, state] of Object.entries(this.roomStates)) {
+        ws.send(
+          JSON.stringify({ type: 'room_state', roomId, state } as DashboardOutgoing),
+        );
+      }
+      for (const [name, value] of Object.entries(this.metrics)) {
+        ws.send(JSON.stringify({ type: 'metric', name, value } as DashboardOutgoing));
+      }
+
+      ws.on('message', (data) => {
+        try {
+          const parsed = JSON.parse(data.toString()) as DashboardIncoming;
+          if (parsed.type === 'start_stream' && this.handlers.onStartStream) {
+            this.handlers.onStartStream(parsed.sessionKey);
+          } else if (parsed.type === 'stop_stream' && this.handlers.onStopStream) {
+            this.handlers.onStopStream(parsed.sessionKey);
+          }
+        } catch (err) {
+          this.logger.warn('dashboard_ws_parse_error', {
+            error: err instanceof Error ? err.message : String(err),
+          });
+        }
+      });
+
+      ws.on('close', () => {
+        this.clients.delete(ws);
+        this.logger.info('dashboard_client_disconnected', { count: this.clients.size });
+        if (this.clients.size === 0 && this.handlers.onDisconnect) {
+          this.handlers.onDisconnect();
+        }
+      });
+    });
+
+    await new Promise<void>((resolve) => {
+      this.httpServer.listen(this.port, () => resolve());
+    });
+    this.logger.info('dashboard_listening', { url: `http://localhost:${this.port}` });
+  }
+
+  async stop(): Promise<void> {
+    for (const ws of this.clients) {
+      try {
+        ws.close();
+      } catch {
+        // ignore
+      }
+    }
+    this.clients.clear();
+    await new Promise<void>((resolve) => {
+      this.wsServer.close(() => resolve());
+    });
+    await new Promise<void>((resolve) => {
+      this.httpServer.close(() => resolve());
+    });
+  }
+
+  broadcast(msg: DashboardOutgoing): void {
+    const payload = JSON.stringify(msg);
+    for (const ws of this.clients) {
+      if (ws.readyState === WebSocket.OPEN) {
+        ws.send(payload);
+      }
+    }
+  }
+
+  /** Create a DashboardReporter wired to this server. */
+  reporter(): DashboardReporter {
+    return {
+      update: (roomId, state) => {
+        this.roomStates[roomId] = { ...this.roomStates[roomId], ...state };
+        this.broadcast({ type: 'room_state', roomId, state });
+      },
+      log: (level, msg, meta) => {
+        this.broadcast({ type: 'log', level, msg, meta, timestamp: Date.now() });
+      },
+      incrementMetric: (name, by = 1) => {
+        this.metrics[name] = (this.metrics[name] ?? 0) + by;
+        this.broadcast({ type: 'metric', name, value: this.metrics[name] });
+      },
+    };
+  }
+}

tests/soak/package.json

@@ -0,0 +1,26 @@
+{
+  "name": "golf-soak",
+  "version": "0.1.0",
+  "private": true,
+  "description": "Multiplayer soak & UX test harness for Golf Card Game",
+  "scripts": {
+    "soak": "tsx runner.ts",
+    "soak:populate": "tsx runner.ts --scenario=populate",
+    "soak:stress": "tsx runner.ts --scenario=stress",
+    "seed": "tsx scripts/seed-accounts.ts",
+    "smoke": "bash scripts/smoke.sh",
+    "test": "vitest run"
+  },
+  "dependencies": {
+    "playwright-core": "^1.40.0",
+    "ws": "^8.16.0"
+  },
+  "devDependencies": {
+    "@playwright/test": "^1.40.0",
+    "tsx": "^4.7.0",
+    "@types/ws": "^8.5.0",
+    "@types/node": "^20.10.0",
+    "typescript": "^5.3.0",
+    "vitest": "^1.2.0"
+  }
+}

tests/soak/runner.ts

@@ -0,0 +1,315 @@
+#!/usr/bin/env tsx
+/**
+ * Golf Soak Harness — entry point.
+ *
+ * Usage:
+ *   TEST_URL=http://localhost:8000 \
+ *   SOAK_INVITE_CODE=SOAKTEST \
+ *     bun run soak -- --scenario=populate --rooms=1 --accounts=2 \
+ *       --cpus-per-room=0 --games-per-room=1 --holes=1 --watch=none
+ */
+
+import * as path from 'path';
+import { spawn } from 'child_process';
+import { parseArgs, mergeConfig, CliArgs } from './config';
+import { createLogger } from './core/logger';
+import { SessionPool } from './core/session-pool';
+import { RoomCoordinator } from './core/room-coordinator';
+import { DashboardServer } from './dashboard/server';
+import { Screencaster } from './core/screencaster';
+import { Watchdog } from './core/watchdog';
+import { Artifacts, pruneOldRuns } from './core/artifacts';
+import { getScenario, listScenarios } from './scenarios';
+import type { DashboardReporter, ScenarioContext, Session } from './core/types';
+
+function noopDashboard(): DashboardReporter {
+  return {
+    update: () => {},
+    log: () => {},
+    incrementMetric: () => {},
+  };
+}
+
+function printScenarioList(): void {
+  console.log('Available scenarios:');
+  for (const s of listScenarios()) {
+    console.log(`  ${s.name.padEnd(12)} ${s.description}`);
+    console.log(
+      `    needs: accounts=${s.needs.accounts}, rooms=${s.needs.rooms ?? 1}, cpus=${s.needs.cpusPerRoom ?? 0}`,
+    );
+  }
+}
+
+async function main(): Promise<void> {
+  const cli: CliArgs = parseArgs(process.argv.slice(2));
+
+  if (cli.listOnly) {
+    printScenarioList();
+    return;
+  }
+
+  if (!cli.scenario) {
+    console.error('Error: --scenario=<name> is required. Use --list to see scenarios.');
+    process.exit(2);
+  }
+
+  const scenario = getScenario(cli.scenario);
+  if (!scenario) {
+    console.error(`Error: unknown scenario "${cli.scenario}". Use --list to see scenarios.`);
+    process.exit(2);
+  }
+
+  const runId =
+    cli.runId ?? `${cli.scenario}-${new Date().toISOString().replace(/[:.]/g, '-')}`;
+  const targetUrl = cli.target ?? process.env.TEST_URL ?? 'http://localhost:8000';
+  const inviteCode = process.env.SOAK_INVITE_CODE ?? 'SOAKTEST';
+  const watch = cli.watch ?? 'dashboard';
+
+  const logger = createLogger({ runId });
+  logger.info('run_start', {
+    scenario: scenario.name,
+    targetUrl,
+    watch,
+    cli,
+  });
+
+  // Artifacts: instantiate now so both failure path + success summary
+  // can reach it. Prune old runs (>7d) on startup so the directory
+  // doesn't grow unbounded.
+  const artifactsRoot = path.resolve(__dirname, 'artifacts');
+  const artifacts = new Artifacts({ runId, rootDir: artifactsRoot, logger });
+  pruneOldRuns(artifactsRoot, 7 * 24 * 3600 * 1000, logger);
+
+  // Resolve final config: scenarioDefaults → env → CLI (later wins)
+  const config = mergeConfig(
+    cli as Record<string, unknown>,
+    process.env,
+    scenario.defaultConfig,
+  );
+
+  // Ensure core knobs exist, falling back to scenario.needs
+  const accounts = Number(config.accounts ?? scenario.needs.accounts);
+  const rooms = Number(config.rooms ?? scenario.needs.rooms ?? 1);
+  const cpusPerRoom = Number(config.cpusPerRoom ?? scenario.needs.cpusPerRoom ?? 0);
+  if (accounts % rooms !== 0) {
+    console.error(
+      `Error: --accounts=${accounts} does not divide evenly into --rooms=${rooms}`,
+    );
+    process.exit(2);
+  }
+  config.accounts = accounts;
+  config.rooms = rooms;
+  config.cpusPerRoom = cpusPerRoom;
+
+  if (cli.dryRun) {
+    logger.info('dry_run', { config });
+    console.log('Dry run OK. Resolved config:');
+    console.log(JSON.stringify(config, null, 2));
+    return;
+  }
+
+  // Build dependencies
+  const credFile = path.resolve(__dirname, '.env.stresstest');
+  const headedHostCount = watch === 'tiled' ? rooms : 0;
+  const pool = new SessionPool({
+    targetUrl,
+    inviteCode,
+    credFile,
+    logger,
+    headedHostCount,
+  });
+  const coordinator = new RoomCoordinator();
+  const screencaster = new Screencaster(logger);
+
+  const abortController = new AbortController();
+
+  // Graceful shutdown: first signal flips abort, scenarios finish the
+  // current turn then unwind. 10 seconds later, if cleanup is still
+  // hanging, the runner force-exits. A second Ctrl-C skips the wait.
+  let forceExitTimer: NodeJS.Timeout | null = null;
+  const onSignal = (sig: string) => {
+    if (abortController.signal.aborted) {
+      logger.warn('force_exit', { signal: sig });
+      process.exit(130);
+    }
+    logger.warn('signal_received', { signal: sig });
+    abortController.abort();
+    forceExitTimer = setTimeout(() => {
+      logger.error('graceful_shutdown_timeout');
+      process.exit(130);
+    }, 10_000);
+  };
+  process.on('SIGINT', () => onSignal('SIGINT'));
+  process.on('SIGTERM', () => onSignal('SIGTERM'));
+
+  // Health probes: every 30s GET /api/health. Three consecutive failures
+  // abort the run with a fatal error so staging outages don't get
+  // misattributed to harness bugs.
+  let healthFailures = 0;
+  const healthTimer = setInterval(async () => {
+    try {
+      const res = await fetch(`${targetUrl}/health`);
+      if (!res.ok) throw new Error(`status ${res.status}`);
+      healthFailures = 0;
+    } catch (err) {
+      healthFailures++;
+      logger.warn('health_probe_failed', {
+        consecutive: healthFailures,
+        error: err instanceof Error ? err.message : String(err),
+      });
+      if (healthFailures >= 3) {
+        logger.error('health_fatal', { consecutive: healthFailures });
+        abortController.abort();
+      }
+    }
+  }, 30_000);
+
+  let dashboardServer: DashboardServer | null = null;
+  let dashboard: DashboardReporter = noopDashboard();
+  const watchdogs = new Map<string, Watchdog>();
+  let exitCode = 0;
+  try {
+    const sessions = await pool.acquire(accounts);
+    logger.info('sessions_acquired', { count: sessions.length });
+
+    // Build a session lookup for click-to-watch
+    const sessionsByKey = new Map<string, Session>();
+    for (const s of sessions) sessionsByKey.set(s.key, s);
+
+    // Dashboard with screencaster handlers now that sessions exist
+    if (watch === 'dashboard') {
+      const port = Number(config.dashboardPort ?? 7777);
+      dashboardServer = new DashboardServer(port, logger, {
+        onStartStream: (key) => {
+          const session = sessionsByKey.get(key);
+          if (!session) {
+            logger.warn('stream_start_unknown_session', { sessionKey: key });
+            return;
+          }
+          screencaster
+            .start(key, session.page, (jpegBase64) => {
+              dashboardServer!.broadcast({ type: 'frame', sessionKey: key, jpegBase64 });
+            })
+            .catch((err) =>
+              logger.error('screencast_start_failed', {
+                sessionKey: key,
+                error: err instanceof Error ? err.message : String(err),
+              }),
+            );
+        },
+        onStopStream: (key) => {
+          screencaster.stop(key).catch(() => {
+            // best-effort — errors already logged inside Screencaster
+          });
+        },
+        onDisconnect: () => {
+          screencaster.stopAll().catch(() => {});
+        },
+      });
+      await dashboardServer.start();
+      dashboard = dashboardServer.reporter();
+      const url = `http://localhost:${port}`;
+      console.log(`Dashboard: ${url}`);
+      try {
+        const opener =
+          process.platform === 'darwin'
+            ? 'open'
+            : process.platform === 'win32'
+              ? 'start'
+              : 'xdg-open';
+        spawn(opener, [url], { stdio: 'ignore', detached: true }).unref();
+      } catch {
+        // If auto-open fails, the URL is already printed.
+      }
+    }
+
+    // Per-room watchdogs — fire if no heartbeat arrives within 60s.
+    // Declared at outer scope so the finally block can stop them and
+    // drain any pending timers before the process exits.
+    for (let i = 0; i < rooms; i++) {
+      const roomId = `room-${i}`;
+      const w = new Watchdog(60_000, () => {
+        logger.error('watchdog_fired', { room: roomId });
+        dashboard.update(roomId, { phase: 'error' });
+        abortController.abort();
+      });
+      w.start();
+      watchdogs.set(roomId, w);
+    }
+
+    const ctx: ScenarioContext = {
+      config,
+      sessions,
+      coordinator,
+      dashboard,
+      logger,
+      signal: abortController.signal,
+      heartbeat: (roomId: string) => {
+        const w = watchdogs.get(roomId);
+        if (w) w.heartbeat();
+      },
+    };
+
+    const result = await scenario.run(ctx);
+    logger.info('run_complete', {
+      gamesCompleted: result.gamesCompleted,
+      errors: result.errors.length,
+      durationMs: result.durationMs,
+    });
+    console.log(`Games completed: ${result.gamesCompleted}`);
+    console.log(`Errors:          ${result.errors.length}`);
+    console.log(`Duration:        ${(result.durationMs / 1000).toFixed(1)}s`);
+    artifacts.writeSummary({
+      runId,
+      scenario: scenario.name,
+      targetUrl,
+      gamesCompleted: result.gamesCompleted,
+      errors: result.errors,
+      durationMs: result.durationMs,
+      customMetrics: result.customMetrics,
+    });
+    if (result.errors.length > 0) {
+      console.log('Errors:');
+      for (const e of result.errors) {
+        console.log(`  ${e.room}: ${e.reason}${e.detail ? ' — ' + e.detail : ''}`);
+      }
+      exitCode = 1;
+    }
+  } catch (err) {
+    logger.error('run_failed', {
+      error: err instanceof Error ? err.message : String(err),
+      stack: err instanceof Error ? err.stack : undefined,
+    });
+    // Best-effort artifact capture from still-live sessions. The pool's
+    // activeSessions field is private but accessible for this error path —
+    // we want every frame we can grab before release() tears them down.
+    try {
+      const liveSessions = (pool as unknown as { activeSessions: Session[] }).activeSessions;
+      if (liveSessions && liveSessions.length > 0) {
+        await artifacts.captureAll(liveSessions);
+      }
+    } catch (captureErr) {
+      logger.warn('artifact_capture_failed', {
+        error: captureErr instanceof Error ? captureErr.message : String(captureErr),
+      });
+    }
+    exitCode = 1;
+  } finally {
+    clearInterval(healthTimer);
+    if (forceExitTimer) clearTimeout(forceExitTimer);
+    for (const w of watchdogs.values()) w.stop();
+    await screencaster.stopAll();
+    await pool.release();
+    if (dashboardServer) {
+      await dashboardServer.stop();
+    }
+  }
+
+  if (abortController.signal.aborted && exitCode === 0) exitCode = 2;
+  process.exit(exitCode);
+}
+
+main().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});

tests/soak/scenarios/index.ts

@@ -0,0 +1,24 @@
+/**
+ * Scenario registry — name → Scenario mapping.
+ *
+ * Runner looks up scenarios by name. Add a new scenario by importing
+ * it here and adding an entry to `registry`. No filesystem scanning,
+ * no magic.
+ */
+
+import type { Scenario } from '../core/types';
+import populate from './populate';
+import stress from './stress';
+
+const registry: Record<string, Scenario> = {
+  populate,
+  stress,
+};
+
+export function getScenario(name: string): Scenario | undefined {
+  return registry[name];
+}
+
+export function listScenarios(): Scenario[] {
+  return Object.values(registry);
+}

tests/soak/scenarios/populate.ts

@@ -0,0 +1,147 @@
+/**
+ * Populate scenario — long multi-round games to populate scoreboards.
+ *
+ * Partitions sessions into N rooms (default 4) and runs gamesPerRoom
+ * games per room in parallel via Promise.allSettled so a failure in
+ * one room never unwinds the others.
+ */
+
+import type {
+  Scenario,
+  ScenarioContext,
+  ScenarioResult,
+  ScenarioError,
+  Session,
+} from '../core/types';
+import { runOneMultiplayerGame } from './shared/multiplayer-game';
+
+const CPU_PERSONALITIES = ['Sofia', 'Marcus', 'Kenji', 'Priya'];
+
+interface PopulateConfig {
+  gamesPerRoom: number;
+  holes: number;
+  decks: number;
+  rooms: number;
+  cpusPerRoom: number;
+  thinkTimeMs: [number, number];
+  interGamePauseMs: number;
+}
+
+function chunk<T>(arr: T[], size: number): T[][] {
+  const out: T[][] = [];
+  for (let i = 0; i < arr.length; i += size) {
+    out.push(arr.slice(i, i + size));
+  }
+  return out;
+}
+
+async function sleep(ms: number): Promise<void> {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+async function runRoom(
+  ctx: ScenarioContext,
+  cfg: PopulateConfig,
+  roomIdx: number,
+  sessions: Session[],
+): Promise<{ completed: number; errors: ScenarioError[] }> {
+  const roomId = `room-${roomIdx}`;
+  const cpuPersonality = CPU_PERSONALITIES[roomIdx % CPU_PERSONALITIES.length];
+  let completed = 0;
+  const errors: ScenarioError[] = [];
+
+  for (let gameNum = 0; gameNum < cfg.gamesPerRoom; gameNum++) {
+    if (ctx.signal.aborted) break;
+    ctx.dashboard.update(roomId, { game: gameNum + 1, totalGames: cfg.gamesPerRoom });
+    ctx.logger.info('game_start', { room: roomId, game: gameNum + 1 });
+
+    const result = await runOneMultiplayerGame(ctx, sessions, {
+      roomId,
+      holes: cfg.holes,
+      decks: cfg.decks,
+      cpusPerRoom: cfg.cpusPerRoom,
+      cpuPersonality,
+      thinkTimeMs: cfg.thinkTimeMs,
+    });
+
+    if (result.completed) {
+      completed++;
+      ctx.logger.info('game_complete', {
+        room: roomId,
+        game: gameNum + 1,
+        turns: result.turns,
+        durationMs: result.durationMs,
+      });
+    } else {
+      errors.push({
+        room: roomId,
+        reason: 'game_failed',
+        detail: result.error,
+        timestamp: Date.now(),
+      });
+      ctx.logger.error('game_failed', { room: roomId, game: gameNum + 1, error: result.error });
+    }
+
+    if (gameNum < cfg.gamesPerRoom - 1) {
+      await sleep(cfg.interGamePauseMs);
+    }
+  }
+
+  return { completed, errors };
+}
+
+const populate: Scenario = {
+  name: 'populate',
+  description: 'Long multi-round games to populate scoreboards',
+  needs: { accounts: 16, rooms: 4, cpusPerRoom: 1 },
+  defaultConfig: {
+    gamesPerRoom: 10,
+    holes: 9,
+    decks: 2,
+    rooms: 4,
+    cpusPerRoom: 1,
+    thinkTimeMs: [800, 2200],
+    interGamePauseMs: 3000,
+  },
+
+  async run(ctx: ScenarioContext): Promise<ScenarioResult> {
+    const start = Date.now();
+    const cfg = ctx.config as unknown as PopulateConfig;
+
+    const perRoom = Math.floor(ctx.sessions.length / cfg.rooms);
+    if (perRoom * cfg.rooms !== ctx.sessions.length) {
+      throw new Error(
+        `populate: ${ctx.sessions.length} sessions does not divide evenly into ${cfg.rooms} rooms`,
+      );
+    }
+    const roomSessions = chunk(ctx.sessions, perRoom);
+
+    const results = await Promise.allSettled(
+      roomSessions.map((sessions, idx) => runRoom(ctx, cfg, idx, sessions)),
+    );
+
+    let gamesCompleted = 0;
+    const errors: ScenarioError[] = [];
+    results.forEach((r, idx) => {
+      if (r.status === 'fulfilled') {
+        gamesCompleted += r.value.completed;
+        errors.push(...r.value.errors);
+      } else {
+        errors.push({
+          room: `room-${idx}`,
+          reason: 'room_threw',
+          detail: r.reason instanceof Error ? r.reason.message : String(r.reason),
+          timestamp: Date.now(),
+        });
+      }
+    });
+
+    return {
+      gamesCompleted,
+      errors,
+      durationMs: Date.now() - start,
+    };
+  },
+};
+
+export default populate;

tests/soak/scenarios/shared/chaos.ts

@@ -0,0 +1,65 @@
+/**
+ * Chaos injector — occasionally fires unexpected UI events while a
+ * game is playing, to hunt race conditions and recovery bugs.
+ *
+ * Called from the stress scenario's background chaos loop. Each call
+ * has `probability` of firing; when it fires it picks one random
+ * event type and runs it against one session.
+ */
+
+import type { Session, Logger } from '../../core/types';
+
+export type ChaosEvent = 'rapid_clicks' | 'tab_blur' | 'brief_offline';
+
+const ALL_EVENTS: ChaosEvent[] = ['rapid_clicks', 'tab_blur', 'brief_offline'];
+
+function pickEvent(): ChaosEvent {
+  return ALL_EVENTS[Math.floor(Math.random() * ALL_EVENTS.length)];
+}
+
+export async function maybeInjectChaos(
+  session: Session,
+  probability: number,
+  logger: Logger,
+  roomId: string,
+): Promise<ChaosEvent | null> {
+  if (Math.random() >= probability) return null;
+
+  const event = pickEvent();
+  logger.info('chaos_injected', { room: roomId, session: session.key, event });
+  try {
+    switch (event) {
+      case 'rapid_clicks': {
+        // Fire 5 rapid clicks at the player's own cards
+        for (let i = 0; i < 5; i++) {
+          await session.page
+            .locator(`#player-cards .card:nth-child(${(i % 6) + 1})`)
+            .click({ timeout: 300 })
+            .catch(() => {});
+        }
+        break;
+      }
+      case 'tab_blur': {
+        // Briefly dispatch blur then focus — simulates user tabbing away
+        await session.page.evaluate(() => {
+          window.dispatchEvent(new Event('blur'));
+          setTimeout(() => window.dispatchEvent(new Event('focus')), 200);
+        });
+        break;
+      }
+      case 'brief_offline': {
+        // 300ms network outage — should trigger client reconnect logic
+        await session.context.setOffline(true);
+        await new Promise((r) => setTimeout(r, 300));
+        await session.context.setOffline(false);
+        break;
+      }
+    }
+  } catch (err) {
+    logger.warn('chaos_error', {
+      event,
+      error: err instanceof Error ? err.message : String(err),
+    });
+  }
+  return event;
+}

tests/soak/scenarios/shared/multiplayer-game.ts

@@ -0,0 +1,133 @@
+/**
+ * runOneMultiplayerGame — the shared "play one game in one room" loop.
+ *
+ * Host creates the room, announces the code via RoomCoordinator,
+ * joiners wait for the code and join concurrently, host adds CPUs and
+ * starts the game, then every session loops on isMyTurn/playTurn until
+ * the game ends (or the abort signal fires, or maxDurationMs elapses).
+ *
+ * Used by both the populate and stress scenarios so the turn loop
+ * lives in exactly one place.
+ */
+
+import type { Session, ScenarioContext } from '../../core/types';
+
+export interface MultiplayerGameOptions {
+  roomId: string;
+  holes: number;
+  decks: number;
+  cpusPerRoom: number;
+  cpuPersonality?: string;
+  /** Per-turn think time in [min, max] ms. */
+  thinkTimeMs: [number, number];
+  /** Max wall-clock time before giving up on the game (ms). */
+  maxDurationMs?: number;
+}
+
+export interface MultiplayerGameResult {
+  completed: boolean;
+  turns: number;
+  durationMs: number;
+  error?: string;
+}
+
+function randomInt(min: number, max: number): number {
+  return Math.floor(Math.random() * (max - min + 1)) + min;
+}
+
+async function sleep(ms: number): Promise<void> {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+export async function runOneMultiplayerGame(
+  ctx: ScenarioContext,
+  sessions: Session[],
+  opts: MultiplayerGameOptions,
+): Promise<MultiplayerGameResult> {
+  const start = Date.now();
+  const [host, ...joiners] = sessions;
+  const maxDuration = opts.maxDurationMs ?? 5 * 60_000;
+
+  try {
+    // Reset every session back to the lobby before starting.
+    // After the first game ends each session is parked on the
+    // game_over screen, which hides the lobby's Create Room button.
+    // goto('/') bounces them back; localStorage-cached auth persists.
+    await Promise.all(sessions.map((s) => s.bot.goto('/')));
+
+    // Use a unique coordinator key per game-start so Deferreds don't
+    // carry stale room codes from previous games. The coordinator's
+    // Promises only resolve once — reusing `opts.roomId` across games
+    // would make joiners receive the first game's code on every game.
+    const coordKey = `${opts.roomId}-${Date.now()}`;
+
+    // Host creates game and announces the code
+    const code = await host.bot.createGame(host.account.username);
+    ctx.coordinator.announce(coordKey, code);
+    ctx.heartbeat(opts.roomId);
+    ctx.dashboard.update(opts.roomId, { phase: 'lobby' });
+    ctx.logger.info('room_created', { room: opts.roomId, code });
+
+    // Joiners join concurrently
+    await Promise.all(
+      joiners.map(async (joiner) => {
+        const awaited = await ctx.coordinator.await(coordKey);
+        await joiner.bot.joinGame(awaited, joiner.account.username);
+      }),
+    );
+    ctx.heartbeat(opts.roomId);
+
+    // Host adds CPUs (if any) and starts
+    for (let i = 0; i < opts.cpusPerRoom; i++) {
+      await host.bot.addCPU(opts.cpuPersonality);
+    }
+    await host.bot.startGame({ holes: opts.holes, decks: opts.decks });
+    ctx.heartbeat(opts.roomId);
+    ctx.dashboard.update(opts.roomId, { phase: 'playing', totalHoles: opts.holes });
+
+    // Concurrent turn loops — one per session
+    const turnCounts = new Array(sessions.length).fill(0);
+
+    async function sessionLoop(sessionIdx: number): Promise<void> {
+      const session = sessions[sessionIdx];
+      while (true) {
+        if (ctx.signal.aborted) return;
+        if (Date.now() - start > maxDuration) return;
+
+        const phase = await session.bot.getGamePhase();
+        if (phase === 'game_over' || phase === 'round_over') return;
+
+        if (await session.bot.isMyTurn()) {
+          await session.bot.playTurn();
+          turnCounts[sessionIdx]++;
+          ctx.heartbeat(opts.roomId);
+          ctx.dashboard.update(opts.roomId, {
+            currentPlayer: session.account.username,
+            moves: turnCounts.reduce((a, b) => a + b, 0),
+          });
+          const thinkMs = randomInt(opts.thinkTimeMs[0], opts.thinkTimeMs[1]);
+          await sleep(thinkMs);
+        } else {
+          await sleep(200);
+        }
+      }
+    }
+
+    await Promise.all(sessions.map((_, i) => sessionLoop(i)));
+
+    const totalTurns = turnCounts.reduce((a, b) => a + b, 0);
+    ctx.dashboard.update(opts.roomId, { phase: 'round_over' });
+    return {
+      completed: true,
+      turns: totalTurns,
+      durationMs: Date.now() - start,
+    };
+  } catch (err) {
+    return {
+      completed: false,
+      turns: 0,
+      durationMs: Date.now() - start,
+      error: err instanceof Error ? err.message : String(err),
+    };
+  }
+}

tests/soak/scenarios/stress.ts

@@ -0,0 +1,171 @@
+/**
+ * Stress scenario — rapid short games with chaos injection.
+ *
+ * Partitions sessions into N rooms (default 4), runs gamesPerRoom
+ * short 1-hole games per room in parallel. While each game plays,
+ * a background loop injects chaos events (rapid clicks, tab blur,
+ * brief offline) with 5% per-turn probability to hunt race
+ * conditions and recovery bugs.
+ */
+
+import type {
+  Scenario,
+  ScenarioContext,
+  ScenarioResult,
+  ScenarioError,
+  Session,
+} from '../core/types';
+import { runOneMultiplayerGame } from './shared/multiplayer-game';
+import { maybeInjectChaos } from './shared/chaos';
+
+interface StressConfig {
+  gamesPerRoom: number;
+  holes: number;
+  decks: number;
+  rooms: number;
+  cpusPerRoom: number;
+  thinkTimeMs: [number, number];
+  interGamePauseMs: number;
+  chaosChance: number;
+}
+
+function chunk<T>(arr: T[], size: number): T[][] {
+  const out: T[][] = [];
+  for (let i = 0; i < arr.length; i += size) out.push(arr.slice(i, i + size));
+  return out;
+}
+
+async function sleep(ms: number): Promise<void> {
+  return new Promise((r) => setTimeout(r, ms));
+}
+
+async function runStressRoom(
+  ctx: ScenarioContext,
+  cfg: StressConfig,
+  roomIdx: number,
+  sessions: Session[],
+): Promise<{ completed: number; errors: ScenarioError[]; chaosFired: number }> {
+  const roomId = `room-${roomIdx}`;
+  let completed = 0;
+  let chaosFired = 0;
+  const errors: ScenarioError[] = [];
+
+  for (let gameNum = 0; gameNum < cfg.gamesPerRoom; gameNum++) {
+    if (ctx.signal.aborted) break;
+
+    ctx.dashboard.update(roomId, { game: gameNum + 1, totalGames: cfg.gamesPerRoom });
+
+    // Background chaos loop — runs concurrently with the game turn loop.
+    // Delay the first tick by 3 seconds so room creation + joiners + game
+    // start have time to complete without chaos interference (rapid clicks
+    // or brief_offline during lobby setup can prevent #create-room-btn
+    // from becoming stable).
+    let chaosActive = true;
+    const chaosLoop = (async () => {
+      await sleep(3000);
+      while (chaosActive && !ctx.signal.aborted) {
+        await sleep(500);
+        for (const session of sessions) {
+          const e = await maybeInjectChaos(
+            session,
+            cfg.chaosChance,
+            ctx.logger,
+            roomId,
+          );
+          if (e) chaosFired++;
+        }
+      }
+    })();
+
+    const result = await runOneMultiplayerGame(ctx, sessions, {
+      roomId,
+      holes: cfg.holes,
+      decks: cfg.decks,
+      cpusPerRoom: cfg.cpusPerRoom,
+      thinkTimeMs: cfg.thinkTimeMs,
+    });
+
+    chaosActive = false;
+    await chaosLoop;
+
+    if (result.completed) {
+      completed++;
+      ctx.logger.info('game_complete', {
+        room: roomId,
+        game: gameNum + 1,
+        turns: result.turns,
+      });
+    } else {
+      errors.push({
+        room: roomId,
+        reason: 'game_failed',
+        detail: result.error,
+        timestamp: Date.now(),
+      });
+      ctx.logger.error('game_failed', { room: roomId, error: result.error });
+    }
+
+    await sleep(cfg.interGamePauseMs);
+  }
+
+  return { completed, errors, chaosFired };
+}
+
+const stress: Scenario = {
+  name: 'stress',
+  description: 'Rapid short games for stability & race condition hunting',
+  needs: { accounts: 16, rooms: 4, cpusPerRoom: 2 },
+  defaultConfig: {
+    gamesPerRoom: 50,
+    holes: 1,
+    decks: 1,
+    rooms: 4,
+    cpusPerRoom: 2,
+    thinkTimeMs: [50, 150],
+    interGamePauseMs: 200,
+    chaosChance: 0.05,
+  },
+
+  async run(ctx: ScenarioContext): Promise<ScenarioResult> {
+    const start = Date.now();
+    const cfg = ctx.config as unknown as StressConfig;
+    const perRoom = Math.floor(ctx.sessions.length / cfg.rooms);
+    if (perRoom * cfg.rooms !== ctx.sessions.length) {
+      throw new Error(
+        `stress: ${ctx.sessions.length} sessions does not divide evenly into ${cfg.rooms} rooms`,
+      );
+    }
+    const roomSessions = chunk(ctx.sessions, perRoom);
+
+    const results = await Promise.allSettled(
+      roomSessions.map((s, idx) => runStressRoom(ctx, cfg, idx, s)),
+    );
+
+    let gamesCompleted = 0;
+    let chaosFired = 0;
+    const errors: ScenarioError[] = [];
+    results.forEach((r, idx) => {
+      if (r.status === 'fulfilled') {
+        gamesCompleted += r.value.completed;
+        chaosFired += r.value.chaosFired;
+        errors.push(...r.value.errors);
+      } else {
+        errors.push({
+          room: `room-${idx}`,
+          reason: 'room_threw',
+          detail: r.reason instanceof Error ? r.reason.message : String(r.reason),
+          timestamp: Date.now(),
+        });
+      }
+    });
+
+    return {
+      gamesCompleted,
+      errors,
+      durationMs: Date.now() - start,
+      customMetrics: { chaos_fired: chaosFired },
+    };
+  },
+};
+
+export default stress;

tests/soak/scripts/seed-accounts.ts

@@ -0,0 +1,60 @@
+#!/usr/bin/env tsx
+/**
+ * Seed N soak-harness accounts via the register endpoint.
+ *
+ * Usage:
+ *   TEST_URL=http://localhost:8000 \
+ *   SOAK_INVITE_CODE=SOAKTEST \
+ *     bun run seed -- --count=16
+ *
+ * The invite code must already exist and be flagged marks_as_test=TRUE
+ * in the target environment. See docs/soak-harness-bringup.md.
+ */
+
+import * as path from 'path';
+import { SessionPool } from '../core/session-pool';
+import { createLogger } from '../core/logger';
+
+function parseArgs(argv: string[]): { count: number } {
+  const result = { count: 16 };
+  for (const arg of argv.slice(2)) {
+    const m = arg.match(/^--count=(\d+)$/);
+    if (m) result.count = parseInt(m[1], 10);
+  }
+  return result;
+}
+
+async function main(): Promise<void> {
+  const { count } = parseArgs(process.argv);
+  const targetUrl = process.env.TEST_URL ?? 'http://localhost:8000';
+  const inviteCode = process.env.SOAK_INVITE_CODE;
+  if (!inviteCode) {
+    console.error('SOAK_INVITE_CODE env var is required');
+    console.error('  Local dev: SOAK_INVITE_CODE=SOAKTEST');
+    console.error('  Staging:   SOAK_INVITE_CODE=5VC2MCCN');
+    process.exit(2);
+  }
+
+  const credFile = path.resolve(__dirname, '..', '.env.stresstest');
+  const logger = createLogger({ runId: `seed-${Date.now()}` });
+
+  logger.info('seed_start', { count, targetUrl, credFile });
+  try {
+    const accounts = await SessionPool.seed({
+      targetUrl,
+      inviteCode,
+      count,
+      credFile,
+      logger,
+    });
+    logger.info('seed_complete', { created: accounts.length });
+    console.error(`Seeded ${accounts.length} accounts → ${credFile}`);
+  } catch (err) {
+    logger.error('seed_failed', {
+      error: err instanceof Error ? err.message : String(err),
+    });
+    process.exit(1);
+  }
+}
+
+main();

tests/soak/scripts/smoke.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+# Soak harness smoke test — end-to-end canary against local dev.
+# Expected runtime: ~60 seconds.
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+
+: "${TEST_URL:=http://localhost:8000}"
+: "${SOAK_INVITE_CODE:=SOAKTEST}"
+
+echo "Smoke target: $TEST_URL"
+echo "Invite code:  $SOAK_INVITE_CODE"
+
+# 1. Health probe
+curl -fsS "$TEST_URL/api/health" > /dev/null || {
+  echo "FAIL: target server unreachable at $TEST_URL"
+  exit 1
+}
+
+# 2. Ensure minimum accounts
+if [ ! -f .env.stresstest ]; then
+  echo "Seeding accounts..."
+  bun run seed -- --count=4
+fi
+
+# 3. Run minimum viable scenario
+TEST_URL="$TEST_URL" SOAK_INVITE_CODE="$SOAK_INVITE_CODE" \
+  bun run soak -- \
+    --scenario=populate \
+    --accounts=2 \
+    --rooms=1 \
+    --cpus-per-room=0 \
+    --games-per-room=1 \
+    --holes=1 \
+    --watch=none
+
+echo "Smoke PASSED"

tests/soak/tests/config.test.ts

@@ -0,0 +1,102 @@
+import { describe, it, expect } from 'vitest';
+import { parseArgs, mergeConfig } from '../config';
+
+describe('parseArgs', () => {
+  it('parses --scenario and numeric flags', () => {
+    const r = parseArgs(['--scenario=populate', '--rooms=4', '--games-per-room=10']);
+    expect(r.scenario).toBe('populate');
+    expect(r.rooms).toBe(4);
+    expect(r.gamesPerRoom).toBe(10);
+  });
+
+  it('parses watch mode', () => {
+    const r = parseArgs(['--scenario=populate', '--watch=none']);
+    expect(r.watch).toBe('none');
+  });
+
+  it('rejects unknown watch mode', () => {
+    expect(() => parseArgs(['--scenario=populate', '--watch=bogus'])).toThrow();
+  });
+
+  it('--list sets listOnly', () => {
+    const r = parseArgs(['--list']);
+    expect(r.listOnly).toBe(true);
+  });
+
+  it('--dry-run sets dryRun', () => {
+    const r = parseArgs(['--scenario=populate', '--dry-run']);
+    expect(r.dryRun).toBe(true);
+  });
+
+  it('parses --accounts, --cpus-per-room, --dashboard-port, --target, --run-id, --holes', () => {
+    const r = parseArgs([
+      '--scenario=stress',
+      '--accounts=8',
+      '--cpus-per-room=2',
+      '--dashboard-port=7777',
+      '--target=http://localhost:8000',
+      '--run-id=test-1',
+      '--holes=1',
+    ]);
+    expect(r.accounts).toBe(8);
+    expect(r.cpusPerRoom).toBe(2);
+    expect(r.dashboardPort).toBe(7777);
+    expect(r.target).toBe('http://localhost:8000');
+    expect(r.runId).toBe('test-1');
+    expect(r.holes).toBe(1);
+  });
+
+  it('throws on non-numeric integer flag', () => {
+    expect(() => parseArgs(['--rooms=four'])).toThrow(/Invalid integer/);
+  });
+});
+
+describe('mergeConfig', () => {
+  it('CLI flags override scenario defaults', () => {
+    const cfg = mergeConfig(
+      { gamesPerRoom: 20 },
+      {},
+      { gamesPerRoom: 5, holes: 9 },
+    );
+    expect(cfg.gamesPerRoom).toBe(20);
+    expect(cfg.holes).toBe(9);
+  });
+
+  it('env overrides scenario defaults but CLI overrides env', () => {
+    const cfg = mergeConfig(
+      { holes: 5 },                 // CLI
+      { SOAK_HOLES: '3' },          // env
+      { holes: 9 },                 // defaults
+    );
+    expect(cfg.holes).toBe(5);      // CLI wins
+  });
+
+  it('env overrides scenario defaults when CLI is absent', () => {
+    const cfg = mergeConfig(
+      {},                           // no CLI
+      { SOAK_HOLES: '3' },          // env
+      { holes: 9 },                 // defaults
+    );
+    expect(cfg.holes).toBe(3);      // env wins over defaults
+  });
+
+  it('scenario defaults fill in unset values', () => {
+    const cfg = mergeConfig(
+      {},
+      {},
+      { gamesPerRoom: 3, holes: 9 },
+    );
+    expect(cfg.gamesPerRoom).toBe(3);
+    expect(cfg.holes).toBe(9);
+  });
+
+  it('env numeric keys are parsed to integers', () => {
+    const cfg = mergeConfig(
+      {},
+      { SOAK_ROOMS: '4', SOAK_ACCOUNTS: '16' },
+      {},
+    );
+    expect(cfg.rooms).toBe(4);
+    expect(cfg.accounts).toBe(16);
+  });
+});

tests/soak/tests/deferred.test.ts

@@ -0,0 +1,24 @@
+import { describe, it, expect } from 'vitest';
+import { deferred } from '../core/deferred';
+
+describe('deferred', () => {
+  it('resolves with the given value', async () => {
+    const d = deferred<string>();
+    d.resolve('hello');
+    await expect(d.promise).resolves.toBe('hello');
+  });
+
+  it('rejects with the given error', async () => {
+    const d = deferred<string>();
+    const err = new Error('boom');
+    d.reject(err);
+    await expect(d.promise).rejects.toBe(err);
+  });
+
+  it('ignores second resolve calls', async () => {
+    const d = deferred<number>();
+    d.resolve(1);
+    d.resolve(2);
+    await expect(d.promise).resolves.toBe(1);
+  });
+});

tests/soak/tests/logger.test.ts

@@ -0,0 +1,52 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { createLogger } from '../core/logger';
+
+describe('logger', () => {
+  let writes: string[];
+  let write: (s: string) => boolean;
+
+  beforeEach(() => {
+    writes = [];
+    write = (s: string) => {
+      writes.push(s);
+      return true;
+    };
+  });
+
+  it('emits a JSON line per call with level and msg', () => {
+    const log = createLogger({ runId: 'r1', write });
+    log.info('hello');
+    expect(writes).toHaveLength(1);
+    const parsed = JSON.parse(writes[0]);
+    expect(parsed.level).toBe('info');
+    expect(parsed.msg).toBe('hello');
+    expect(parsed.runId).toBe('r1');
+    expect(parsed.timestamp).toBeTypeOf('string');
+  });
+
+  it('merges meta into the log line', () => {
+    const log = createLogger({ runId: 'r1', write });
+    log.warn('slow', { turnMs: 3000 });
+    const parsed = JSON.parse(writes[0]);
+    expect(parsed.turnMs).toBe(3000);
+    expect(parsed.level).toBe('warn');
+  });
+
+  it('child logger inherits parent meta', () => {
+    const log = createLogger({ runId: 'r1', write });
+    const roomLog = log.child({ room: 'room-1' });
+    roomLog.info('game_start');
+    const parsed = JSON.parse(writes[0]);
+    expect(parsed.room).toBe('room-1');
+    expect(parsed.runId).toBe('r1');
+  });
+
+  it('respects minimum level', () => {
+    const log = createLogger({ runId: 'r1', write, minLevel: 'warn' });
+    log.debug('nope');
+    log.info('nope');
+    log.warn('yes');
+    log.error('yes');
+    expect(writes).toHaveLength(2);
+  });
+});

tests/soak/tests/room-coordinator.test.ts

@@ -0,0 +1,29 @@
+import { describe, it, expect } from 'vitest';
+import { RoomCoordinator } from '../core/room-coordinator';
+
+describe('RoomCoordinator', () => {
+  it('resolves await with the announced code (announce then await)', async () => {
+    const rc = new RoomCoordinator();
+    rc.announce('room-1', 'ABCD');
+    await expect(rc.await('room-1')).resolves.toBe('ABCD');
+  });
+
+  it('resolves await with the announced code (await then announce)', async () => {
+    const rc = new RoomCoordinator();
+    const p = rc.await('room-2');
+    rc.announce('room-2', 'WXYZ');
+    await expect(p).resolves.toBe('WXYZ');
+  });
+
+  it('rejects await after timeout if not announced', async () => {
+    const rc = new RoomCoordinator();
+    await expect(rc.await('room-3', 50)).rejects.toThrow(/timed out/i);
+  });
+
+  it('isolates rooms — announcing room-A does not unblock room-B', async () => {
+    const rc = new RoomCoordinator();
+    const pB = rc.await('room-B', 100);
+    rc.announce('room-A', 'A-CODE');
+    await expect(pB).rejects.toThrow(/timed out/i);
+  });
+});

tests/soak/tests/watchdog.test.ts

@@ -0,0 +1,50 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { Watchdog } from '../core/watchdog';
+
+describe('Watchdog', () => {
+  beforeEach(() => {
+    vi.useFakeTimers();
+  });
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  it('fires after timeout if no heartbeat', () => {
+    const onTimeout = vi.fn();
+    const w = new Watchdog(1000, onTimeout);
+    w.start();
+    vi.advanceTimersByTime(1001);
+    expect(onTimeout).toHaveBeenCalledOnce();
+  });
+
+  it('heartbeat resets the timer', () => {
+    const onTimeout = vi.fn();
+    const w = new Watchdog(1000, onTimeout);
+    w.start();
+    vi.advanceTimersByTime(800);
+    w.heartbeat();
+    vi.advanceTimersByTime(800);
+    expect(onTimeout).not.toHaveBeenCalled();
+    vi.advanceTimersByTime(300);
+    expect(onTimeout).toHaveBeenCalledOnce();
+  });
+
+  it('stop cancels pending timeout', () => {
+    const onTimeout = vi.fn();
+    const w = new Watchdog(1000, onTimeout);
+    w.start();
+    w.stop();
+    vi.advanceTimersByTime(2000);
+    expect(onTimeout).not.toHaveBeenCalled();
+  });
+
+  it('does not fire twice after stop', () => {
+    const onTimeout = vi.fn();
+    const w = new Watchdog(1000, onTimeout);
+    w.start();
+    vi.advanceTimersByTime(1001);
+    w.heartbeat();
+    vi.advanceTimersByTime(1001);
+    expect(onTimeout).toHaveBeenCalledOnce();
+  });
+});

tests/soak/tsconfig.json

@@ -0,0 +1,24 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "declaration": false,
+    "sourceMap": true,
+    "outDir": "./dist",
+    "baseUrl": ".",
+    "lib": ["ES2022", "DOM"],
+    "paths": {
+      "@soak/*": ["./*"],
+      "@bot/*": ["../e2e/bot/*"],
+      "@playwright/test": ["./node_modules/@playwright/test"]
+    }
+  },
+  "include": ["**/*.ts"],
+  "exclude": ["node_modules", "dist", "artifacts"]
+}