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Problem: When parent turn finishes early, all child SubTurns receive "context canceled" error,because child context was derived from parent context. Solution: Implement a lifecycle management system that distinguishes between: - Graceful finish (Finish(false)): signals parentEnded, children continue - Hard abort (Finish(true)): immediately cancels all children Changes: - turn_state.go: - Add parentEnded atomic.Bool to signal parent completion - Add parentTurnState reference for IsParentEnded() checks - Modify Finish(isHardAbort bool) to distinguish abort types - subturn.go: - Add Critical bool to SubTurnConfig (Critical SubTurns continue after parent ends) - Add Timeout time.Duration for SubTurn self-protection - Use independent context (context.Background()) instead of derived context - SubTurns check IsParentEnded() to decide whether to continue or exit - loop.go: - Call Finish(false) for normal completion (graceful) - Add IsParentEnded() check in LLM iteration loop - steering.go: - HardAbort calls Finish(true) to immediately cancel children Behavior: - Normal finish: parentEnded=true, children continue, orphan results delivered - Hard abort: all children cancelled immediately via context - Critical SubTurns: continue running after parent finishes gracefully - Non-Critical SubTurns: can exit gracefully when IsParentEnded() returns true