Initial commit: Agent Governance System Phase 8

Phase 8 Production Hardening with complete governance infrastructure:

- Vault integration with tiered policies (T0-T4)
- DragonflyDB state management
- SQLite audit ledger
- Pipeline DSL and templates
- Promotion/revocation engine
- Checkpoint system for session persistence
- Health manager and circuit breaker for fault tolerance
- GitHub/Slack integrations
- Architectural test pipeline with bug watcher, suggestion engine, council review
- Multi-agent chaos testing framework

Test Results:
- Governance tests: 68/68 passing
- E2E workflow: 16/16 passing
- Phase 2 Vault: 14/14 passing
- Integration tests: 27/27 passing

Coverage: 57.6% average across 12 phases

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/mocks/__init__.py

@@ -0,0 +1,21 @@
+"""
+Mock infrastructure for agent governance testing.
+
+Provides deterministic mock implementations of:
+- Vault (policy engine)
+- DragonflyDB (runtime state)
+- LLM (language model responses)
+- Blackboard (shared memory)
+"""
+
+from .mock_vault import MockVault
+from .mock_dragonfly import MockDragonfly
+from .mock_llm import MockLLM
+from .mock_blackboard import MockBlackboard
+
+__all__ = [
+    'MockVault',
+    'MockDragonfly',
+    'MockLLM',
+    'MockBlackboard'
+]