Stopping or removing a pane that has sub-agents now asks first. Stop offers a choice between stopping the whole subtree or only the parent (leaving the sub-agents running); Remove confirms that every sub-pane underneath will be torn down too.
The task schedule preview understands more shapes. Weekdays-only, weekend-only, and multi-time patterns now read as "Weekdays at 9h, 17h" instead of falling back to "Custom schedule".

Removing a pane with several sub-agents no longer freezes the sidebar for a beat per subtree. The process-tree teardown now happens off the main thread, so the UI stays responsive while children are signalled.