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>

ledger/schema.sql

@@ -0,0 +1,65 @@
+-- Agent Governance Ledger Schema
+
+CREATE TABLE IF NOT EXISTS agent_actions (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    timestamp TEXT NOT NULL,
+    agent_id TEXT NOT NULL,
+    agent_version TEXT NOT NULL,
+    tier INTEGER NOT NULL,
+    action TEXT NOT NULL,
+    decision TEXT NOT NULL,
+    confidence REAL NOT NULL,
+    target TEXT,
+    side_effects TEXT,  -- JSON array
+    success INTEGER NOT NULL,  -- 0 or 1
+    error_type TEXT,
+    error_message TEXT,
+    vault_token_accessor TEXT,
+    session_id TEXT,
+    created_at TEXT DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS agent_metrics (
+    agent_id TEXT PRIMARY KEY,
+    current_tier INTEGER DEFAULT 0,
+    compliant_runs INTEGER DEFAULT 0,
+    consecutive_compliant INTEGER DEFAULT 0,
+    total_runs INTEGER DEFAULT 0,
+    last_violation_at TEXT,
+    last_active_at TEXT,
+    promotion_eligible INTEGER DEFAULT 0,
+    updated_at TEXT DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS violations (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    timestamp TEXT NOT NULL,
+    agent_id TEXT NOT NULL,
+    violation_type TEXT NOT NULL,
+    severity TEXT NOT NULL,  -- low, medium, high, critical
+    description TEXT NOT NULL,
+    triggering_action TEXT,
+    evidence TEXT,  -- JSON
+    remediation TEXT,
+    acknowledged INTEGER DEFAULT 0,
+    acknowledged_by TEXT,
+    created_at TEXT DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS promotions (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    timestamp TEXT NOT NULL,
+    agent_id TEXT NOT NULL,
+    from_tier INTEGER NOT NULL,
+    to_tier INTEGER NOT NULL,
+    approved_by TEXT NOT NULL,
+    rationale TEXT,
+    evidence TEXT,  -- JSON: compliant runs, etc.
+    created_at TEXT DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Indexes
+CREATE INDEX IF NOT EXISTS idx_actions_agent ON agent_actions(agent_id);
+CREATE INDEX IF NOT EXISTS idx_actions_timestamp ON agent_actions(timestamp);
+CREATE INDEX IF NOT EXISTS idx_violations_agent ON violations(agent_id);
+CREATE INDEX IF NOT EXISTS idx_violations_severity ON violations(severity);