[codex] Add runtime circuit breaker for pre-claim exits

[saltbo]

Summary

• add a daemon runtime circuit breaker that opens when the same task fails to enter the workflow 3 times before claim
• skip release attempts for todo tasks in RuntimePool.finalize() and orphan session reaping; only release tasks that are actually in_progress
• pause dispatch per runtime while the circuit is open, then allow one half-open probe after cooldown
• log pre-claim runtime failures with the captured reason when available

Root Cause

Worker agents claim tasks themselves. When a spawned runtime session exited before claim, the task stayed todo, but daemon cleanup still attempted releaseTask. That produced repeated 409s and allowed the same task/runtime pair to keep spawning sessions.

Validation

• pre-commit passed: biome, typecheck, full vitest suite (101 files, 2312 tests)
• targeted runtime tests passed: runtimePool-coverage, runtimePool-finalize, runtime-circuit-breaker

Notes

• I did not run the daemon smoke test because it requires refreshing/installing the local ak CLI, and the request explicitly said not to install ak locally.

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	agent-kanban	aaaceb9	May 19 2026, 03:38 PM