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rcourtman
b1f445b33d
Adds comprehensive error resilience: - Circuit breaker with closed/open/half-open states (3 failures = trip) - Exponential backoff with jitter (2s initial, 2x multiplier, 5min max) - Dead-letter queue for tasks exceeding 5 retry attempts - Error classification (transient vs permanent) using internal/errors helpers - Per-instance failure tracking and breaker state management - Integration with staleness tracker for outcome recording Task 7 of 10 complete (70%). Ready for API surfaces and testing.