Why: an existing authorized task should not merge a moving target merely to resume local work, while new task startup and delivery remain strict.
Evidence: SELF red-green recovery and environment regressions; task, recovery, evidence and local-mode write-guard suites passed through make evidence.
Impact: add explicit LOCAL_READY and task-resume, validate worktree/card/baseline and receipt purpose, preserve schema 1 and prevent local receipts from starting or releasing tasks.
Refs: U2; policy/merge-queue.md; .task/feature-merge-queue-policy-draft.md