fix(test): tolerate owner kwarg in compaction summary resolve_endpoint mock (#3304)

#2996 made context_compactor call resolve_endpoint('utility', owner=owner),
but the mock added by #2174 stubbed it as lambda which: ..., which rejects the
owner kwarg. Each PR passed alone; merged on dev the two compaction tests fail
with TypeError and the pytest job goes red. Widen the mock to lambda *a, **k.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_compaction_summary_failure.py

@@ -48,7 +48,7 @@ class TestCompactionSummaryFailure:
         cc.get_context_length = lambda url, model: context_length
         cc.estimate_tokens = lambda msgs: 10000  # well over the threshold
         cc.llm_call_async = _boom
-        cc.resolve_endpoint = lambda which: (None, None, None)
+        cc.resolve_endpoint = lambda *a, **k: (None, None, None)
         cc._update_session_history = lambda *a, **k: None
         try:
             return asyncio.run(