fix(authz): use SyncClient instead of async Client

authzed.api.v1.Client is async (returns UnaryUnaryCall futures).
SyncClient returns responses directly. Problem solved.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ImTotem

src/bcsd_api/authz/client.py

@@ -1,7 +1,7 @@
 from authzed.api.v1 import (
     CheckPermissionRequest,
     CheckPermissionResponse,
-    Client,
+    SyncClient as Client,
     ObjectReference,
     Relationship,
     RelationshipUpdate,
@@ -39,12 +39,6 @@ def _update(operation, res_type: str, res_id: str, relation: str, user_id: str)
     )
 
 
-def _resolve(call):
-    if callable(getattr(call, "result", None)):
-        return call.result()  # type: ignore[union-attr]
-    return call
-
-
 class AuthzClient:
     def __init__(self, endpoint: str, token: str):
         self._client = Client(
@@ -53,14 +47,13 @@ def __init__(self, endpoint: str, token: str):
         )
 
     def check(self, res_type: str, res_id: str, permission: str, user_id: str) -> bool:
-        call = self._client.CheckPermission(
+        resp = self._client.CheckPermission(
             CheckPermissionRequest(
                 resource=_object_ref(res_type, res_id),
                 permission=permission,
                 subject=_subject_ref(user_id),
             )
         )
-        resp = _resolve(call)
         return resp.permissionship == _HAS
 
     def add_relation(self, res_type: str, res_id: str, relation: str, user_id: str) -> None:
@@ -70,9 +63,9 @@ def remove_relation(self, res_type: str, res_id: str, relation: str, user_id: st
         self._write(_DELETE, res_type, res_id, relation, user_id)
 
     def write_schema(self, schema: str) -> None:
-        _resolve(self._client.WriteSchema(WriteSchemaRequest(schema=schema)))
+        self._client.WriteSchema(WriteSchemaRequest(schema=schema))
 
     def _write(self, operation: int, res_type: str, res_id: str, relation: str, user_id: str) -> None:
-        _resolve(self._client.WriteRelationships(
+        self._client.WriteRelationships(
             WriteRelationshipsRequest(updates=[_update(operation, res_type, res_id, relation, user_id)])
-        ))
+        )