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Fixes #16092 The app-server-backed TUI could accumulate ghost subagent entries in `/agent` after resume/backfill flows. Some of those rows were no longer live according to the backend, but still appeared selectable in the picker and could open as blank threads. *Cause* Unlike the legacy tui behavior, tui_app_server was creating local picker/replay state for subagents discovered through metadata refresh and loaded-thread backfill, even when no real local session or transcript had been attached. That let stale ids survive in the picker as if they were replayable threads. *Fix* Stop creating empty local thread channels during subagent metadata hydration and loaded-thread backfill. When opening /agent, prune metadata-only entries that thread/read reports as terminally unavailable. When selecting a discovered subagent that is still live but not yet locally attached, materialize a real local session on demand from thread/read instead of falling back to an empty replay state.