test(reindex): stub db.mark_indexed in FU-1/FU-2a ingest fixtures (FU-3 interaction)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

mcp-server/tests/test_idempotent_ingest.py

@@ -110,6 +110,9 @@ def test_ingest_calls_recompute_searchable(monkeypatch, tmp_path):
 
     async def _recompute(cid): calls["recompute"].append(cid)
     monkeypatch.setattr(ingest.db, "recompute_searchable", _recompute)
+
+    async def _mark_indexed(cid): return None
+    monkeypatch.setattr(ingest.db, "mark_indexed", _mark_indexed)
     monkeypatch.setattr(ingest.config, "PARENT_DOC_RETRIEVAL_ENABLED", False)
     monkeypatch.setattr(ingest.config, "MULTIMODAL_ENABLED", False)