Added soft-delete reliability sweeps and guardrails to prevent blocker residue from persisting across delete operations, including column drift detection, deleted row sweep guards, and in-progress delete reconciliation, with comprehensive test coverage and documentation updates to the soft-delete ve Fusion-Task-Id: FN-5566 Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai> Fusion-Task-Id: FN-5566