Implement circuit breaker pattern to prevent infinite retry loops on
repeated failures (SEC-ORCH-7). The circuit breaker tracks consecutive
failures and opens after a threshold is reached, blocking further
requests until a cooldown period elapses.
Circuit breaker states:
- CLOSED: Normal operation, requests pass through
- OPEN: After N consecutive failures, all requests blocked
- HALF_OPEN: After cooldown, allow one test request
Changes:
- Add circuit_breaker.py with CircuitBreaker class
- Integrate circuit breaker into Coordinator.start() loop
- Integrate circuit breaker into OrchestrationLoop.start() loop
- Integrate per-agent circuit breakers into ContextMonitor
- Add comprehensive tests for circuit breaker behavior
- Log state transitions and circuit breaker stats on shutdown
Configuration (defaults):
- failure_threshold: 5 consecutive failures
- cooldown_seconds: 30 seconds
Refs #338
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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