fix: make qdrant vector hit parsing total

harness/tht/adapters/vector/qdrant.py

@@ -1,5 +1,6 @@
 """Qdrant-backed vector store for one workspace-owned semantic collection."""
 
+import math
 import re
 from collections.abc import Callable
 from uuid import NAMESPACE_URL, uuid5
@@ -477,16 +478,25 @@ class QdrantVectorStore:
             raise VectorResponseError("Qdrant returned malformed query response")
         payload = point.get("payload")
         score = point.get("score")
+        required_payload_leaves = (
+            "record_key", "record_kind", "kind", "ref", "title", "content"
+        )
         if (
             not isinstance(payload, dict)
             or type(score) not in (int, float)
             or any(
-                key in payload and not isinstance(payload[key], str)
-                for key in ("record_key", "record_kind", "kind", "ref", "title", "content")
+                key not in payload or not isinstance(payload[key], str)
+                for key in required_payload_leaves
             )
         ):
             raise VectorResponseError("Qdrant returned malformed query response")
-        return hit_from_metadata(float(score), payload)
+        try:
+            similarity = float(score)
+        except (OverflowError, ValueError) as exc:
+            raise VectorResponseError("Qdrant returned malformed query response") from exc
+        if not math.isfinite(similarity):
+            raise VectorResponseError("Qdrant returned malformed query response")
+        return hit_from_metadata(similarity, payload)
 
     def _call(self, method: str, path: str, payload: dict | None, allow_missing: bool = False) -> dict | None:
         try: