CliAgentEnv: add TASK_FINISHED stop-signal hook #1243

Bugbot Review

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Final Result: Bugbot completed review and found 1 potential issue.

Request ID: serverGenReqId_b64e6047-a225-4065-bbf8-f1bc196ef2b1

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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^{Reviewed by Cursor Bugbot for commit ed421b3. Configure here.}