feat(navi): semantic query router for intelligent tool selection - Phase H2b

Add centroid-based query classifier that routes Aurora queries to the
appropriate handler (nav_route, nav_reverse_geocode, direct_answer,
rag_search) before the RAG pipeline runs. Uses TEI embeddings against
pre-computed route centroids from 38 example queries.

- query_router.py: standalone module with lazy centroid init
- query_router_test.py: 7-query test suite (all passing)
- Corresponding recon_rag_tool.py v4.2.0 deployed to Open WebUI DB

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/query_router_test.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+"""Test suite for the semantic query router."""
+
+import sys
+import os
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from lib.query_router import classify
+
+TEST_QUERIES = [
+    ("how do I get from Buhl to Boise", "nav_route"),
+    ("what does the survival manual say about water", "rag_search"),
+    ("what town is at 42.5, -114.7", "nav_reverse_geocode"),
+    ("hey aurora", "direct_answer"),
+    ("what's the fastest way to Sun Valley", "nav_route"),
+    ("how to purify water in the field", "rag_search"),
+    ("good morning", "direct_answer"),
+]
+
+
+def main():
+    print("Query Router Test Suite")
+    print("=" * 70)
+
+    passed = 0
+    failed = 0
+
+    for query, expected in TEST_QUERIES:
+        route, confidence = classify(query)
+        status = "PASS" if route == expected else "FAIL"
+        if status == "PASS":
+            passed += 1
+        else:
+            failed += 1
+        print(f"  [{status}] {query!r}")
+        print(f"         → {route} ({confidence:.3f})  expected={expected}")
+
+    print("=" * 70)
+    print(f"Results: {passed}/{passed + failed} passed")
+    if failed:
+        print(f"  {failed} FAILED")
+        sys.exit(1)
+    else:
+        print("  All tests passed!")
+
+
+if __name__ == "__main__":
+    main()