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>

agents/tier0-agent/plans/plan-20260123-163928-bbd5dfb1.json

@@ -0,0 +1,41 @@
+{
+  "plan_id": "plan-20260123-163928-bbd5dfb1",
+  "title": "Deploy Nginx Reverse Proxy",
+  "description": "Deploy Nginx as reverse proxy for Spark UI with basic auth",
+  "target": "localhost",
+  "steps": [
+    {
+      "action": "pull_image",
+      "description": "Pull Nginx image",
+      "command": "docker pull nginx:alpine"
+    },
+    {
+      "action": "create_config",
+      "description": "Create nginx config directory",
+      "command": "mkdir -p /opt/agent-governance/agents/tier0-agent/workspace/nginx"
+    },
+    {
+      "action": "run_container",
+      "description": "Start Nginx proxy",
+      "command": "docker run -d --name nginx-proxy --network spark-net -p 8080:80 nginx:alpine"
+    },
+    {
+      "action": "verify",
+      "description": "Verify Nginx responds",
+      "command": "curl -s http://localhost:8080 | grep -q nginx"
+    }
+  ],
+  "rollback_steps": [
+    {
+      "action": "stop_container",
+      "command": "docker stop nginx-proxy && docker rm nginx-proxy"
+    }
+  ],
+  "created_at": "2026-01-23T21:39:28.520158+00:00",
+  "agent_id": "tier0-agent-001",
+  "agent_tier": 0,
+  "status": "approved",
+  "requires_approval": true,
+  "approved_by": "human-operator",
+  "executed": true
+}