Single-file QC populated executor.context['user'] from current_user_email()
in routes.py, but batch QC routed through BatchQCExecutor — which never
accepted a user kwarg or set context['user'] on its per-file QCExecutor
instances. Result: every LLM call from a batched HM QC run logged as
anonymous in the Usage dashboard, only single-file and Video QC runs
showed the user's email.
BatchQCExecutor now takes user and stamps it onto each per-file
executor's context just before execute(), matching the Video QC
batch executor pattern.
4aa74b114a