- Added SlotPool initialization to queue test helpers to align WorkerPool fixtures with slot-aware execution.
- Updated cancellation and shutdown queue tests with slot_uid-aware _dispatch stubs.
- Added sandbox tests covering _chown_workspace root/non-root and Linux/non-Linux behavior.
- Added ensure_workspace test coverage that it forwards slot_uid into _chown_workspace calls.
- Expanded _run_rpc_blocking tests to verify HOME/token env handling and slot_uid user/group mapping.
- Adjusted stop() in src/robomp/queue.py to cancel in-flight hookless workers after drain timeout.
- Added _shutdown_cancelled tracking so _run_event only skips failed marking for deliberately interrupted deliveries.
- Ensured unrelated dispatch errors during drain are marked failed instead of being silently requeued.
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