fix(retrieval): fail open on registry resolution errors

tests/test_ingestion.py

@@ -163,6 +163,45 @@ def test_ingest_file_derives_project_id_from_registry_root(tmp_data_dir, tmp_pat
     assert all(meta["project_id"] == "p04-gigabit" for meta in fake_store.metadatas)
 
 
+def test_ingest_file_logs_and_fails_open_when_project_derivation_fails(
+    tmp_data_dir,
+    sample_markdown,
+    monkeypatch,
+):
+    """A broken registry should be visible but should not block ingestion."""
+    init_db()
+    warnings = []
+
+    class FakeVectorStore:
+        def __init__(self):
+            self.metadatas = []
+
+        def add(self, ids, documents, metadatas):
+            self.metadatas.extend(metadatas)
+
+        def delete(self, ids):
+            return None
+
+    fake_store = FakeVectorStore()
+    monkeypatch.setattr("atocore.ingestion.pipeline.get_vector_store", lambda: fake_store)
+    monkeypatch.setattr(
+        "atocore.projects.registry.derive_project_id_for_path",
+        lambda path: (_ for _ in ()).throw(ValueError("registry broken")),
+    )
+    monkeypatch.setattr(
+        "atocore.ingestion.pipeline.log.warning",
+        lambda event, **kwargs: warnings.append((event, kwargs)),
+    )
+
+    result = ingest_file(sample_markdown)
+
+    assert result["status"] == "ingested"
+    assert fake_store.metadatas
+    assert all(meta["project_id"] == "" for meta in fake_store.metadatas)
+    assert warnings[0][0] == "project_id_derivation_failed"
+    assert "registry broken" in warnings[0][1]["error"]
+
+
 def test_ingest_project_folder_passes_project_id_to_files(tmp_data_dir, sample_folder, monkeypatch):
     seen = []