fix: close task3 qdrant and config validation gaps

harness/tht/config.py

@@ -664,13 +664,16 @@ def _validate_internal_embedding_contract(raw: dict[str, Any], path: Path) -> No
         )
 
 
-def _normalize_qdrant_base_url(value: str) -> str:
-    parsed = urlparse(value)
-    hostname = (parsed.hostname or "").lower()
+def _normalize_qdrant_base_url(value: Any) -> str | None:
+    """Normalize a URL, returning ``None`` for untrusted raw YAML values."""
+    if not isinstance(value, str):
+        return None
     try:
+        parsed = urlparse(value)
+        hostname = (parsed.hostname or "").lower()
         port = parsed.port
-    except ValueError:
-        port = None
+    except (TypeError, ValueError):
+        return None
     host = f"[{hostname}]" if ":" in hostname and not hostname.startswith("[") else hostname
     netloc = f"{host}:{port}" if port is not None else host
     return f"{parsed.scheme.lower()}://{netloc}{parsed.path.rstrip('/') or '/'}"
@@ -687,9 +690,18 @@ def _validate_vector_resource_consistency(raw: dict[str, Any], translated: dict[
         raise ConfigError(
             f"Configurazione non valida in {path}: vectors and resources.vector must both describe qdrant"
         )
-    if _normalize_qdrant_base_url(vectors.get("base_url", "")) != _normalize_qdrant_base_url(
-        resource.get("base_url", "")
-    ) or vectors.get("collection") != resource.get("collection"):
+    vector_url = _normalize_qdrant_base_url(vectors.get("base_url"))
+    resource_url = _normalize_qdrant_base_url(resource.get("base_url"))
+    vector_collection = vectors.get("collection")
+    resource_collection = resource.get("collection")
+    if (
+        vector_url is None
+        or resource_url is None
+        or not isinstance(vector_collection, str)
+        or not isinstance(resource_collection, str)
+        or vector_url != resource_url
+        or vector_collection != resource_collection
+    ):
         raise ConfigError(
             f"Configurazione non valida in {path}: vectors and resources.vector disagree"
         )