fix: harden task3 qdrant compatibility boundaries

harness/tests/test_qdrant_cli_commands.py

@@ -218,6 +218,53 @@ def test_vector_index_schema_json_is_single_document(monkeypatch, tmp_path):
     assert payload["counts"]["added"] == 2
 
 
+def test_vector_index_schema_json_maps_require_existing_delete_race(monkeypatch, tmp_path):
+    cfg = _qdrant_runtime_config(tmp_path)
+    _write_schema_artifacts(tmp_path)
+    monkeypatch.setattr("tht.cli.vector_cmd.make_embedder", lambda _: SimpleNamespace(embed_documents=lambda docs: [[0.1] * 1024 for _ in docs]))
+    keyword_indexes = {
+        "content_hash", "document_id", "kind", "record_key", "record_kind",
+        "vector_generation", "workspace_id", "workspace_revision",
+    }
+    deleted = False
+
+    class Response:
+        def __init__(self, status_code, payload=None):
+            self.status_code = status_code
+            self.ok = status_code < 400
+            self._payload = payload
+            self.text = "" if payload is None else "{}"
+
+        def json(self):
+            return self._payload
+
+    def request(method, url, **kwargs):
+        nonlocal deleted
+        if method == "POST" and url.endswith("/points/scroll"):
+            return Response(200, {"result": {"points": [], "next_page_offset": None}})
+        if method == "GET" and url.endswith("/collections/psd-clinical"):
+            if deleted:
+                return Response(404, {"status": {"error": "missing"}})
+            response = Response(200, {"result": {
+                "config": {"params": {"vectors": {"size": 1024, "distance": "Cosine"}}},
+                "payload_schema": {
+                    key: {"data_type": "keyword"} for key in keyword_indexes
+                },
+            }})
+            deleted = True
+            return response
+        if method == "PUT" and "/points?wait=true" in url:
+            return Response(404, {"status": {"error": "missing"}})
+        raise AssertionError((method, url))
+
+    monkeypatch.setattr("requests.request", request)
+    response = CliRunner().invoke(app, ["vector", "index-schema", "--json", "-c", str(cfg)])
+
+    assert response.exit_code == 1
+    assert response.stdout == '{"code":"semantic_index_incompatible","status":"failed"}\n'
+    assert response.stderr == ""
+
+
 def test_vector_index_schema_json_failure_is_safe(monkeypatch, tmp_path):
     import json