feat(omnibase_infra): add circuit breaker event emission [OMN-5293]

[jonahgabriel]

Summary

• Adds SUFFIX_CIRCUIT_BREAKER_STATE topic constant (onex.evt.omnibase-infra.circuit-breaker.v1)
• Creates ModelCircuitBreakerStateEvent Pydantic model with service_name, state, previous_state, failure_count, threshold, timestamp
• Creates CircuitBreakerEventPublisher that publishes state-transition events for CLOSED→OPEN, OPEN→HALF_OPEN, HALF_OPEN→CLOSED transitions
• Registers topic in ALL_OMNIBASE_INFRA_TOPIC_SPECS (3 partitions, 7-day retention)
• Adds parity gate allowlist entry and pattern exemption for service_name field
• Regenerates enum_omnibase_infra_topic.py

Test plan

• 8 unit tests added: all state transitions, bus error swallowing, correlation ID threading, topic format validation
• All pre-commit hooks pass
• uv run pytest tests/unit/services/test_circuit_breaker_event_publisher.py — 8/8 passed

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0d97e71b-ba77-41c4-9599-bf372e8f25f9

📥 Commits

Reviewing files that changed from the base of the PR and between b4c0aae and e719188.

⛔ Files ignored due to path filters (1)

• src/omnibase_infra/enums/generated/enum_omnibase_infra_topic.py is excluded by !**/generated/**

📒 Files selected for processing (10)

• scripts/check_contract_topic_parity.py
• src/omnibase_infra/event_bus/topic_constants.py
• src/omnibase_infra/models/resilience/__init__.py
• src/omnibase_infra/models/resilience/model_circuit_breaker_state_event.py
• src/omnibase_infra/services/__init__.py
• src/omnibase_infra/services/service_circuit_breaker_event_publisher.py
• src/omnibase_infra/topics/__init__.py
• src/omnibase_infra/topics/platform_topic_suffixes.py
• src/omnibase_infra/validation/validation_exemptions.yaml
• tests/unit/services/test_circuit_breaker_event_publisher.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jonahgabriel/omn-5293-t29-circuit-breaker-dashboard

📝 Coding Plan

• Generate coding plan for human review comments

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