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>

integrations/__init__.py

@@ -0,0 +1,38 @@
+"""
+External Integrations for Agent Governance System
+
+Available integrations:
+- GitHub: PR creation, commit status, issue tracking
+- Slack: Notifications, alerts, approval workflows
+"""
+
+from .common.base import (
+    IntegrationConfig,
+    IntegrationEvent,
+    BaseIntegration,
+    IntegrationManager
+)
+from .github.github import GitHubIntegration
+from .slack.slack import SlackIntegration
+
+__all__ = [
+    'IntegrationConfig',
+    'IntegrationEvent',
+    'BaseIntegration',
+    'IntegrationManager',
+    'GitHubIntegration',
+    'SlackIntegration'
+]
+
+
+def create_manager() -> IntegrationManager:
+    """Create an integration manager with all available integrations"""
+    manager = IntegrationManager()
+
+    # Register GitHub (will be disabled if no token)
+    manager.register(GitHubIntegration())
+
+    # Register Slack (will be disabled if no credentials)
+    manager.register(SlackIntegration())
+
+    return manager