First full end-to-end milestone: parses CLI, builds SessionPool +
RoomCoordinator, loads a scenario by name, runs it, reports results,
cleans up. Watch modes other than "none" log a warning and fall back
until Tasks 19-24 implement them.
Smoke test passed against local dev:
bun run soak -- --scenario=populate --accounts=2 --rooms=1
--cpus-per-room=0 --games-per-room=1 --holes=1 --watch=none
→ Games completed: 1, Errors: 0, Duration: 78.2s, exit 0
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>