test: stub build_chunk_embeddings in parity tests

surfsense_backend/tests/unit/middleware/test_kb_persistence_filesystem_parity.py

@@ -69,13 +69,25 @@ class _FakeSession:
 
 @pytest.fixture(autouse=True)
 def _stub_embeddings_and_chunks(monkeypatch: pytest.MonkeyPatch) -> None:
-    """Avoid loading the embedding model in unit tests."""
+    """Avoid loading the embedding model in unit tests.
+
+    Mirrors the legacy stub: one chunk spanning the whole content, with a
+    zero summary/chunk vector, routed through the shared span builder.
+    """
+    from app.indexing_pipeline.document_chunker import ChunkSlice
+
+    async def _fake_build_chunk_embeddings(content: str, *, use_code_chunker: bool):
+        summary = np.zeros(8, dtype=np.float32)
+        pairs = (
+            [(ChunkSlice(content, 0, len(content)), np.zeros(8, dtype=np.float32))]
+            if content
+            else []
+        )
+        return summary, pairs
+
     monkeypatch.setattr(
-        kb_persistence,
+        kb_persistence, "build_chunk_embeddings", _fake_build_chunk_embeddings
-        "embed_texts",
-        lambda texts: [np.zeros(8, dtype=np.float32) for _ in texts],
     )
-    monkeypatch.setattr(kb_persistence, "chunk_text", lambda content: [content])
 
 
 @pytest.mark.asyncio