feat(sqs): leadership-refusal hook + flag flip (Phase 3.D PR 4-B-3b)#723

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bootjp wants to merge 2 commits intomainfrom

feat/sqs-htfifo-leadership-refusal

Commits on Apr 30, 2026

feat(sqs): leadership-refusal hook + flag flip (Phase 3.D PR 4-B-3b)
bootjp
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fix(sqs): leader-callback race + panic log + TOCTOU + branch coverage
bootjp
committed