- Changed abort() method signature to return Promise<void> instead of void, making it async-compatible.
- Added bash executor fallback to one-shot shell execution when persistent sessions fail to respond to cancellation.
- Fixed bash execution timeout handling to prevent subsequent commands from hanging after hard timeouts.
- Extracted abort token management into ShellAbortState for thread-safe cancellation handling across shell sessions.
- Added SessionManager.close() method for proper cleanup of persistent writers and session resources.
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