feat(soak): scaffold tests/soak package

Placeholder runner, tsconfig with @bot alias to tests/e2e/bot,
gitignored .env.stresstest + artifacts. Real behavior follows
in Task 10 onward.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/soak/package.json

@@ -0,0 +1,25 @@
+{
+  "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": {
+    "tsx": "^4.7.0",
+    "@types/ws": "^8.5.0",
+    "@types/node": "^20.10.0",
+    "typescript": "^5.3.0",
+    "vitest": "^1.2.0"
+  }
+}