Why: bind the task validation checkpoint to the integration baseline. Evidence: SELF recursive component checks; sync_base=ed3847c85ce111a74f0cb100908abfb40f62db07; before_record=398e8e6ff91eb5109878f69c6a2ca6ef7c174513. Impact: task metadata only. Refs: .task/archive/feature-fast-slow-o2-a01-evidence-design.md