Add SessionEnd hooks for thread teardown#33895
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## What changed - Add the `SessionEnd` hook event to hook configuration, protocol schemas, analytics, and the hooks browser. - Run matching hooks for root threads during shutdown, including app-server archive, delete, idle unload, and graceful shutdown. Flush the transcript first and provide the session ID, transcript path, working directory, and `reason: "other"`. - Keep teardown bounded: hook output is advisory, the default timeout is one second, configured timeouts are capped at three seconds, and async hooks run synchronously with a warning. ## Testing - Cover transcript availability, matcher selection, timeout normalization, ignored control output, subagent exclusion, archive/delete ordering, and graceful shutdown of multiple loaded threads. GitOrigin-RevId: 5d19a658677a137caf836ed5042dcb43f5eb6d1a
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Add SessionEnd hooks for thread teardown
What changed
SessionEndhook event to hook configuration, protocol schemas, analytics, and the hooks browser.reason: "other".Testing