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>

testing/oversight/__init__.py

@@ -0,0 +1,39 @@
+"""
+Architectural Test Pipeline - Multi-Layer Oversight System
+===========================================================
+
+A comprehensive validation framework ensuring no single hidden bug can compromise
+the Agent Governance System. Provides continuous validation across all 12 phases.
+
+Components:
+- BugWindowWatcher: Real-time anomaly detection
+- SuggestionEngine: AI-driven fix recommendations
+- CouncilReview: Multi-agent decision making
+- PhaseValidator: Coverage across all phases
+- ErrorInjector: Controlled fault injection for testing
+- Reporter: Comprehensive reporting
+
+Usage:
+    from testing.oversight import ArchitecturalTestPipeline
+
+    pipeline = ArchitecturalTestPipeline()
+    report = pipeline.run_full_validation()
+"""
+
+from .pipeline import ArchitecturalTestPipeline
+from .bug_watcher import BugWindowWatcher
+from .suggestion_engine import SuggestionEngine
+from .council import CouncilReview
+from .phase_validator import PhaseValidator
+from .error_injector import ErrorInjector
+from .reporter import OversightReporter
+
+__all__ = [
+    'ArchitecturalTestPipeline',
+    'BugWindowWatcher',
+    'SuggestionEngine',
+    'CouncilReview',
+    'PhaseValidator',
+    'ErrorInjector',
+    'OversightReporter',
+]