The batch_retain and consolidation task handlers created internal
RequestContext objects without tenant_id or api_key_id. This meant
downstream operations (consolidation, mental model refreshes) triggered
by async workers lost the original caller's request context.
Fix by passing tenant_id and api_key_id through the task payload dict
in submit_async_retain and submit_async_consolidation, then restoring
them in the corresponding handlers (_handle_batch_retain,
_handle_consolidation).
44d912533c