Fix plan implementation prompt reappearing after /agent thread switch #10447
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Summary
This fixes a UX bug (#10442) where the "Implement this plan?" prompt could reappear after switching agents with
/agentand then switching back to the original agent during plan execution.Root Cause
On thread switch, the TUI rebuilds
ChatWidget, replays buffered thread events, then drains any queued live events.In this flow, a
TurnCompletecan be handled twice for the same logical turn:from_replay = true)from_replay = false)ChatWidgetusedsaw_plan_item_this_turnto decide whether to show the plan implementation prompt, but that flag was only reset onTurnStarted.If duplicate completion events occurred, stale
saw_plan_item_this_turn = truecould cause the prompt to re-trigger unexpectedly.Fix
saw_plan_item_this_turnat the end ofon_task_complete, after prompt gating runs.TurnCompletehandling from reopening the prompt.