feat(navi): address book with geocoding integration

- YAML-backed saved locations (config/address_book.yaml)
- Exact/partial alias matching with case-insensitive lookup
- Flask blueprint: /api/address_book/lookup, /api/address_book/list
- Geocoder short-circuits Photon when address book has exact match
- Test suite for lookup behavior

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

lib/address_book_test.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python3
+"""Tests for RECON address book module."""
+import sys
+import os
+
+# Add project root to path
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from lib import address_book
+
+TESTS = [
+    ("lookup('home') → exact",
+     lambda: address_book.lookup("home"),
+     lambda r: r is not None and r['confidence'] == 'exact' and r['id'] == 'home'),
+
+    ("lookup('Home') → exact (case-insensitive)",
+     lambda: address_book.lookup("Home"),
+     lambda r: r is not None and r['confidence'] == 'exact' and r['id'] == 'home'),
+
+    ("lookup('214 north st') → exact via alias",
+     lambda: address_book.lookup("214 north st"),
+     lambda r: r is not None and r['confidence'] == 'exact' and r['id'] == 'home'),
+
+    ("lookup('214 North Street') → exact via alias",
+     lambda: address_book.lookup("214 North Street"),
+     lambda r: r is not None and r['confidence'] == 'exact' and r['id'] == 'home'),
+
+    ("lookup('nonexistent place') → None",
+     lambda: address_book.lookup("nonexistent place"),
+     lambda r: r is None),
+
+    ("list_all() → 1 entry",
+     lambda: address_book.list_all(),
+     lambda r: isinstance(r, list) and len(r) == 1 and r[0]['id'] == 'home'),
+]
+
+passed = 0
+failed = 0
+for name, fn, check in TESTS:
+    try:
+        result = fn()
+        ok = check(result)
+    except Exception as e:
+        ok = False
+        result = f"EXCEPTION: {e}"
+
+    status = "PASS" if ok else "FAIL"
+    if ok:
+        passed += 1
+    else:
+        failed += 1
+    print(f"  [{status}] {name}")
+    if not ok:
+        print(f"          got: {result}")
+
+print(f"\n{passed} passed, {failed} failed")
+sys.exit(0 if failed == 0 else 1)