test(rules): the scope test says why a rule search returned nothing - an error or an empty scan (#4958)

semantic_search_rules fails open, so both failures on run 8209 and main
run 8212 read as set() with no trace. Assert report["searched"] and carry
the swallowed traceback into the failure.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_integration_rule_scope.py

@@ -7,6 +7,7 @@ join doing the scoping: these seed real rules with hand-made vectors and stub
 only the embedder, so every rule is an equally good match and the home alone
 decides what comes back.
 """
+import traceback
 import uuid
 from unittest.mock import AsyncMock, MagicMock, patch
 
@@ -74,10 +75,20 @@ async def homes():
 
 
 async def _found(user_id: int, **scope) -> set[int]:
+    """The rule ids a search finds — and a failure, not an empty set, when the
+    search never ran. `semantic_search_rules` fails open (an exception becomes
+    []), so without `report["searched"]` an error and a scoping miss read the
+    same (#4958)."""
+    report: dict = {}
+    raised: list[str] = []
     with patch("scribe.services.embeddings.get_embedding",
-               AsyncMock(return_value=QUERY_VEC)):
+               AsyncMock(return_value=QUERY_VEC)), \
+            patch("scribe.services.embeddings.logger") as log:
+        # Called inside the except block, so the traceback is still current.
+        log.warning.side_effect = lambda *_a, **_k: raised.append(traceback.format_exc())
         hits = await semantic_search_rules(user_id, "anything", limit=10,
-                                           threshold=0.5, **scope)
+                                           threshold=0.5, report=report, **scope)
+    assert report.get("searched"), "the rule search did not run:\n" + "\n".join(raised)
     return {rule.id for _score, rule in hits}