Refresh the subagent picker in the background - #35693
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## Why Opening the subagent picker could wait on thread metadata and live event-store locks, delaying terminal input. Its cached entries could also omit descendants that were not observed in the current TUI session. ## What changed - Render the picker immediately from cached navigation state and refresh root descendants asynchronously with `thread/list`. - Merge discovered descendants into an open picker while preserving its selection and live status, and coalesce concurrent refresh requests. - Ignore refresh responses from a previous session and avoid blocking on busy event stores. ## Testing - Extend session lifecycle coverage for nonblocking picker opens, refresh coalescing, descendant discovery, selection preservation, and status updates. - Add coverage for rejecting a refresh response after navigation state is cleared. GitOrigin-RevId: 7eae7f696f8d2d323a47b3fd2800ea1c1cdbf2a0
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Refresh the subagent picker in the background
Why
Opening the subagent picker could wait on thread metadata and live event-store locks, delaying terminal input. Its cached entries could also omit descendants that were not observed in the current TUI session.
What changed
thread/list.Testing