Tasks 12 + 13: worker node agent + Phi-4-mini query triage

Task 12 — node_agent/agent.py: standalone AMQP worker agent
  config reader, model discovery, registration publisher,
  ping/pong handler, model swap with systemctl + health poll
  (14 tests)

Task 13 — triage.py: query classification + cluster node selection
  classify_query() routes to Phi-4-mini at :8083
  select_node() picks best worker by model affinity
  get_inference_url() replaces hardcoded LLAMA_SERVER_BASE
  cluster.py stores node ip for URL construction
  (6 tests + 5 existing chat tests mocked for triage)

168 tests passing (+20 new)

config.py

@@ -9,7 +9,7 @@ import logging
 
 log = logging.getLogger("caic")
 
-VERSION = "v0.14.0"
+VERSION = "v0.15.0"
 OLLAMA_BASE = os.environ.get("OLLAMA_BASE", "http://localhost:11434")
 LLAMA_SERVER_BASE = os.environ.get("LLAMA_SERVER_BASE", "http://192.168.50.108:8081")
 SEARXNG_BASE = "http://localhost:8888"
@@ -102,6 +102,11 @@ ALLOWED_SETTINGS_KEYS = {
     "skills_enabled",
 }
 
+# --- Triage / query routing ---
+TRIAGE_BASE = os.environ.get("CAIC_TRIAGE_BASE", "http://127.0.0.1:8083/v1")
+TRIAGE_TIMEOUT = 10
+FALLBACK_TO_DEFAULT = True
+
 # --- Perplexity ---
 PERPLEXITY_THRESHOLD = 15.0