fix: close task3 qdrant and config validation gaps

harness/tests/test_qdrant_vector_store.py

@@ -2,7 +2,7 @@ from uuid import NAMESPACE_URL, uuid5
 
 import pytest
 import requests
-from qdrant_test_helpers import FakeQdrantHttp, _write_record
+from qdrant_test_helpers import FakeQdrantHttp, FakeResponse, _write_record
 
 from tht.adapters.vector.qdrant import QdrantVectorStore, point_id
 from tht.ports.vector import VectorStoreError
@@ -51,6 +51,59 @@ def test_require_existing_refuses_missing_collection_without_mutations():
     assert [call for call in fake.calls if call[0] == "PUT"] == []
 
 
+def test_require_existing_preflights_before_existing_hash_scroll():
+    fake = FakeQdrantHttp()
+    original_request = fake.request
+
+    def request(method, url, **kwargs):
+        if method == "POST" and url.endswith("/points/scroll"):
+            return FakeResponse(404, {"status": "error"})
+        return original_request(method, url, **kwargs)
+
+    store = QdrantVectorStore(
+        base_url="http://qdrant:6333", collection="workspace-semantic", workspace_id="demo",
+        workspace_revision="a" * 40, expected_dimension=1024,
+        collection_lifecycle="require_existing", request=request,
+    )
+
+    with pytest.raises(VectorStoreError, match="semantic_index_incompatible"):
+        store.existing_hashes("memory", ["memory"])
+
+    assert [call for call in fake.calls if call[1].endswith("/points/scroll")] == []
+    assert [call for call in fake.calls if call[0] == "PUT"] == []
+
+
+def test_require_existing_delete_maps_collection_404_after_preflight():
+    fake = FakeQdrantHttp()
+    fake.collection = {"vectors": {"size": 1024, "distance": "Cosine"}}
+    fake.payload_indexes = {
+        "content_hash", "document_id", "kind", "record_key", "record_kind",
+        "vector_generation", "workspace_id", "workspace_revision",
+    }
+    original_request = fake.request
+    deleted = False
+
+    def request(method, url, **kwargs):
+        nonlocal deleted
+        if method == "GET" and url.endswith("/collections/workspace-semantic") and not deleted:
+            response = original_request(method, url, **kwargs)
+            deleted = True
+            fake.collection = None
+            return response
+        if method == "POST" and url.endswith("/points/delete?wait=true"):
+            original_request(method, url, **kwargs)
+            return FakeResponse(404, {"status": "error"})
+        return original_request(method, url, **kwargs)
+
+    store = QdrantVectorStore(
+        base_url="http://qdrant:6333", collection="workspace-semantic", workspace_id="demo",
+        workspace_revision="a" * 40, expected_dimension=1024,
+        collection_lifecycle="require_existing", request=request,
+    )
+
+    with pytest.raises(VectorStoreError, match="semantic_index_incompatible"):
+        store.delete_kinds("memory", ["memory"])
+
 @pytest.mark.parametrize(
     ("dimension", "distance", "indexes", "index_types"),
     [(384, "Cosine", set(), {}),