feat: Node Self-Healing, DAGI Audit, Agent Prompts, Infra Invariants

### Backend (city-service)
- Node Registry + Self-Healing API (migration 039)
- Improved get_all_nodes() with robust fallback for node_registry/node_cache
- Agent Prompts Runtime API for DAGI Router integration
- DAGI Router Audit endpoints (phantom/stale detection)
- Node Agents API (Guardian/Steward)
- Node metrics extended (CPU/GPU/RAM/Disk)

### Frontend (apps/web)
- Node Directory with improved error handling
- Node Cabinet with metrics cards
- DAGI Router Card component
- Node Metrics Card component
- useDAGIAudit hook

### Scripts
- check-invariants.py - deploy verification
- node-bootstrap.sh - node self-registration
- node-guardian-loop.py - continuous self-healing
- dagi_agent_audit.py - DAGI audit utility

### Migrations
- 034: Agent prompts seed
- 035: Agent DAGI audit
- 036: Node metrics extended
- 037: Node agents complete
- 038: Agent prompts full coverage
- 039: Node registry self-healing

### Tests
- test_infra_smoke.py
- test_agent_prompts_runtime.py
- test_dagi_router_api.py

### Documentation
- DEPLOY_CHECKLIST_2024_11_30.md
- Multiple TASK_PHASE docs

scripts/deploy-prod.sh

@@ -188,18 +188,64 @@ echo "  - Docker logs: docker logs <container_name>"
 echo "  - Application logs: $LOG_DIR"
 echo "  - Caddy logs: docker logs daarion-caddy"
 
+# Run infrastructure invariants check
+log_info "Running infrastructure invariants check..."
+INVARIANTS_FAILED=0
+
+# Wait a bit more for services to fully initialize
+sleep 5
+
+# Run invariants check
+if [ -f "scripts/check-invariants.py" ]; then
+    # Try to run invariants check
+    if command -v python3 &> /dev/null; then
+        # Use internal Docker network URL or localhost
+        CITY_URL="${CITY_SERVICE_URL:-http://localhost:7001}"
+        
+        python3 scripts/check-invariants.py --base-url "$CITY_URL" || {
+            INVARIANTS_FAILED=1
+            log_error "Infrastructure invariants check FAILED!"
+        }
+    else
+        log_warning "Python3 not found, skipping invariants check"
+    fi
+else
+    log_warning "check-invariants.py not found, skipping invariants check"
+fi
+
+# Run smoke tests (optional)
+if [ -f "tests/test_infra_smoke.py" ] && [ "$RUN_SMOKE_TESTS" = "true" ]; then
+    log_info "Running smoke tests..."
+    pytest tests/test_infra_smoke.py -v --tb=short || {
+        log_warning "Some smoke tests failed (non-blocking)"
+    }
+fi
+
 # Success message
 echo ""
-if [ $HEALTH_FAILED -eq 0 ]; then
+if [ $HEALTH_FAILED -eq 0 ] && [ $INVARIANTS_FAILED -eq 0 ]; then
     log_success "🎉 Deployment completed successfully!"
     echo ""
     echo "  🌐 Application: https://app.daarion.space"
     echo "  📊 Monitoring: https://app.daarion.space/grafana/"
     echo ""
+    echo "  ✅ All infrastructure invariants passed"
+    echo ""
     echo "  Next steps:"
-    echo "    1. Run smoke tests: docs/DEPLOY_SMOKETEST_CHECKLIST.md"
+    echo "    1. Run smoke tests: RUN_SMOKE_TESTS=true ./scripts/deploy-prod.sh"
     echo "    2. Monitor logs: docker logs -f daarion-gateway"
     echo "    3. Check metrics: docker stats"
+elif [ $INVARIANTS_FAILED -eq 1 ]; then
+    log_error "Deployment completed but INVARIANTS CHECK FAILED!"
+    echo ""
+    echo "  ❌ Some infrastructure invariants are not met."
+    echo "  Please review the output above and fix the issues."
+    echo ""
+    echo "  Common fixes:"
+    echo "    1. Run migrations: scripts/migrate.sh"
+    echo "    2. Seed agents: psql < migrations/038_agent_prompts_full_coverage.sql"
+    echo "    3. Check node_cache: psql < migrations/036_node_metrics_extended.sql"
+    exit 1
 else
     log_error "Deployment completed with errors. Check logs above."
     exit 1