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* fix(discord): flush thread mappings on shutdown to survive restart (#2897) The Discord channel already persists channel->thread mappings, but a mapping created right before a hard shutdown (process killed between thread creation and its background persistence write) could still be lost. Flush in-memory mappings in stop() as a best-effort safety net. Add regression tests covering the persist/load round-trip across a simulated restart and the stop() flush path. Refs #2897 * fix(discord): gate stop() flush on _thread_store_loaded (#5461 review) Address review feedback: - Only flush thread mappings from stop() once _load_active_threads() has run, so a stop() taken before the load (start() bailed on a missing bot_token / discord import error) cannot overwrite the store with {}. - Fix isort order in the test module (ruff I001). - Make the restart test a plain sync test (it never awaits). - Add a regression test proving stop() does not clobber the store before load. * fix(discord): gate stop() flush on _thread_store_loaded (#5461 review) Address review feedback: - Only flush thread mappings from stop() once _load_active_threads() has run, so a stop() taken before the load (start() bailed on a missing bot_token / discord import error) cannot overwrite the store with {}. - Fix isort order in the test module (ruff I001). - Make the restart test a plain sync test (it never awaits). - Add a regression test proving stop() does not clobber the store before load. --------- Co-authored-by: wcy12378 <wcy12378@users.noreply.github.com>