ctx.ui.confirm()/select()/input() from extensions now open daemon-owned
pending dialog records, publish dialog.opened/dialog.closed, and park a
Promise that settles on the browser's answer or cancel, the extension's
own signal/timeout, the extensionDialogsTimeoutMs daemon default (5 min,
0 = forever; tuning knob, not a gate), agent_end for run-scoped dialogs,
or session-ended on close/replace/dispose. Answers resolve the parked
extension Promise directly via POST /sessions/:id/dialogs/answer|cancel
- never the prompt queue - with first-wins stale semantics across
browsers, and SessionStatus.pendingDialogs rehydrates reloading clients.
