Why: bind the task validation checkpoint to the latest integration baseline. Evidence: SELF recursive component checks; sync_base=a70ed114fba2d51bb93ec8cb0662703ab0bc0614; candidate=3d2f4ecf9218cdb6c228f9552e7993d68f8f9537. Impact: task metadata only. Refs: .task/feature-collab-storage-u6-events.md