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* fix(sandbox): create shell session before retrying on a fresh id The AIO sandbox recovery path generated a UUID and passed it straight to exec_command(id=...). The sandbox image only auto-creates a session when exec_command is called with *no* id; an exec carrying an unknown id returns HTTP 404 "Session not found". So every ErrorObservation recovery itself 404'd, turning a transient session lapse into an unrecoverable tool error that looped the run up to the LangGraph recursion limit. Explicitly create_session(id=fresh_id) before targeting that id on retry. create_session is idempotent (returns the existing session if the id already exists), so this is safe under the serializing lock. Updated the regression test to assert the retry targets exactly the created session id rather than a fabricated, uncreated one. * fix(sandbox): release the one-shot recovery session after retry The fresh session created on the ErrorObservation recovery path is used for exactly one command -- the next execute_command runs with no id and returns to the default session. Under persistent session corruption every command would create another session that is never reused or released, accumulating sessions on the container. Release it best-effort with cleanup_session() in a finally, swallowing any cleanup error so it never masks a successful retry. Addresses review feedback on #3577. --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>