Fix plan regex: require numeric identifier after תב"ע

Previously matched any word after תב"ע (e.g., "תב"ע ואין", "תב"ע קיפחה").
Now requires a plan number (digits/hyphens) — reduces false positives from 24 to 4
on the Hecht case test.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

mcp-server/src/legal_mcp/services/references_extractor.py

@@ -23,12 +23,12 @@ logger = logging.getLogger(__name__)
 PLAN_PATTERNS = [
     # תמ"א with number
     re.compile(r'תמ"א\s*[\-]?\s*(\d+)(?:\s*[\-/]\s*(\S+))?'),
-    # תכנית מתאר with identifiers
+    # תכנית מתאר with identifiers (must have a number)
     re.compile(r'תכנית\s+(?:מתאר\s+)?(?:ארצית|מחוזית|מקומית)?\s*(?:מס[\'"]?\s*)?(\d[\d/\-\.]+\S*)'),
-    # תב"ע with identifiers
-    re.compile(r'תב"ע\s*(?:מס[\'"]?\s*)?(\S+)'),
-    # Specific plan number patterns (e.g., 62/3, ירושלים 12345)
-    re.compile(r'תכנית\s+(\S+\s*\d[\d/\-\.]+\S*)'),
+    # תב"ע with plan number (must start with digit or contain hyphen+digits)
+    re.compile(r'תב"ע\s+(?:מס[\'"]?\s*)?(\d[\d/\-\.]+\S*)'),
+    # Plan number pattern (e.g., 102-1170893, 62/3)
+    re.compile(r'תכנית\s+(?:מס[\'"]?\s*)?(\d[\d/\-\.]+\S*)'),
 ]
 
 # Case law (פסיקה)