Parked Inbox cards claim no stage. Build tiles and open headers read Not started until a worker exists — the triage checkpoint is no longer shown for work that never began.
No split trigger without a worker. Propose split hides on parked cards (there is no triage worker to propose from); the trigger RPC refuses threadless cards as a backstop.
Inbox exits spawn with creation-time choices. Leaving the Inbox on any track starts through the shared starter, which resolves the pinned preset override (provider/model) and the card's own project workspace.