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* fix(runtime): prevent dual execution after forced cancel - keep bookkeeping until task termination - block restart while any execution task is still alive - make execution registration atomic under lock - avoid premature cleanup on cancel timeout - add regression tests for forced-cancel restart scenarios * chore: ruff format and import order --------- Co-authored-by: kowshikmente <kowshikmente@kowshikmentes-MacBook-Pro.local> Co-authored-by: hundao <alchemy_wimp@hotmail.com>