feat(simulator): Grafana monitoring over generated Parquet

Monitoring compose profile: dependency-free Prometheus exporter that
scans the Parquet output with DuckDB (rows, detections, pose frames,
battery, RSSI, link distance, bytes on disk), Prometheus scrape config
and a provisioned Grafana dashboard. Demonstrates the observability
doctrine: fleet statistics derived from the data platform itself.

simulator/docker-compose.yml

@@ -15,3 +15,41 @@ services:
       BROADCAST_ADDR: ${BROADCAST_ADDR:-255.255.255.255}
     volumes:
       - ./data:/data
+
+  # --- Monitoring profile: docker compose --profile monitoring up ---
+
+  exporter:
+    build: .
+    profiles: [monitoring]
+    command: ["python", "monitoring/exporter.py"]
+    environment:
+      DATA_DIR: /data
+      SCAN_INTERVAL_S: "5"
+    volumes:
+      - ./data:/data:ro
+      - ./monitoring:/app/monitoring:ro
+    ports:
+      - "9105:9105"
+
+  prometheus:
+    image: prom/prometheus:v2.53.0
+    profiles: [monitoring]
+    volumes:
+      - ./monitoring/prometheus.yml:/etc/prometheus/prometheus.yml:ro
+    ports:
+      - "9090:9090"
+
+  grafana:
+    image: grafana/grafana:11.1.0
+    profiles: [monitoring]
+    environment:
+      GF_AUTH_ANONYMOUS_ENABLED: "true"
+      GF_AUTH_ANONYMOUS_ORG_ROLE: Admin
+      GF_AUTH_DISABLE_LOGIN_FORM: "true"
+    volumes:
+      - ./monitoring/grafana/provisioning:/etc/grafana/provisioning:ro
+      - ./monitoring/grafana/dashboards:/var/lib/grafana/dashboards:ro
+    ports:
+      - "3000:3000"
+    depends_on:
+      - prometheus