fix: return short prompt when 'my village' named but no village specified

Prevents the full route calendar dump when user clicks 'Find my village's
schedule' without yet naming a village — LLM was listing all 27 routes as
'examples'. Now returns a one-line prompt asking for the village name.

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

query_tool.py

@@ -430,6 +430,17 @@ class LibraryQueryTool:
         if not has_trigger and not (month_in_q is not None and has_mobile_ctx) and not (has_relative_day and has_mobile_ctx):
             return None
 
+        # If the user said "my village" / "my town" / "my area" without naming one,
+        # return a short prompt rather than flooding them with every route's schedule.
+        _PLACEHOLDER_VILLAGE = {"my village", "my town", "my area", "my location", "my place"}
+        if any(ph in q for ph in _PLACEHOLDER_VILLAGE) and not has_relative_day and not month_in_q:
+            return (
+                "**Mobile Library — find your village's schedule**\n\n"
+                "Just tell me the name of your village or town and I'll look up "
+                "when the mobile library visits.\n\n"
+                "*Example: \"When does the mobile library visit Kempsey?\"*"
+            )
+
         today = datetime.date.today()
 
         # Handle "today" / "tomorrow" — return routes running on that specific date