node2: fix Sofiia routing determinism + Node Capabilities Service

Bug fixes:
- Bug A: GROK_API_KEY env mismatch — router expected GROK_API_KEY but only
  XAI_API_KEY was present. Added GROK_API_KEY=${XAI_API_KEY} alias in compose.
- Bug B: 'grok' profile missing in router-config.node2.yml — added cloud_grok
  profile (provider: grok, model: grok-2-1212). Sofiia now has
  default_llm=cloud_grok with fallback_llm=local_default_coder.
- Bug C: Router silently defaulted to cloud DeepSeek when profile was unknown.
  Now falls back to agent.fallback_llm or local_default_coder with WARNING log.
  Hardcoded Ollama URL (172.18.0.1) replaced with config-driven base_url.

New service: Node Capabilities Service (NCS)
- services/node-capabilities/ — FastAPI microservice exposing live model
  inventory from Ollama, Swapper, and llama-server.
- GET /capabilities — canonical JSON with served_models[] and inventory_only[]
- GET /capabilities/models — flat list of served models
- POST /capabilities/refresh — force cache refresh
- Cache TTL 15s, bound to 127.0.0.1:8099
- services/router/capabilities_client.py — async client with TTL cache

Artifacts:
- ops/node2_models_audit.md — 3-layer model view (served/disk/cloud)
- ops/node2_models_audit.yml — machine-readable audit
- ops/node2_capabilities_example.json — sample NCS output (14 served models)

Made-with: Cursor

docker-compose.node2-sofiia.yml

@@ -23,6 +23,10 @@ services:
       - PIECES_OS_URL=http://host.docker.internal:39300
       - NOTION_API_KEY=${NOTION_API_KEY:-}
       - XAI_API_KEY=${XAI_API_KEY}
+      - GROK_API_KEY=${XAI_API_KEY}
+      - DEEPSEEK_API_KEY=${DEEPSEEK_API_KEY:-}
+      # ── Node Capabilities ─────────────────────────────────────────────────
+      - NODE_CAPABILITIES_URL=http://node-capabilities:8099/capabilities
       # ── Persistence backends ──────────────────────────────────────────────
       - ALERT_BACKEND=postgres
       - ALERT_DATABASE_URL=${ALERT_DATABASE_URL:-${DATABASE_URL}}
@@ -39,6 +43,7 @@ services:
       - "daarion-city-service:host-gateway"
     depends_on:
       - dagi-nats
+      - node-capabilities
     networks:
       - dagi-network
       - dagi-memory-network
@@ -103,6 +108,27 @@ services:
       - dagi-network
     restart: unless-stopped
 
+  node-capabilities:
+    build:
+      context: ./services/node-capabilities
+      dockerfile: Dockerfile
+    container_name: node-capabilities-node2
+    ports:
+      - "127.0.0.1:8099:8099"
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
+    environment:
+      - NODE_ID=NODA2
+      - OLLAMA_BASE_URL=http://host.docker.internal:11434
+      - SWAPPER_URL=http://swapper-service:8890
+      - LLAMA_SERVER_URL=http://host.docker.internal:11435
+      - CACHE_TTL_SEC=15
+    depends_on:
+      - swapper-service
+    networks:
+      - dagi-network
+    restart: unless-stopped
+
   sofiia-console:
     build:
       context: ./services/sofiia-console