SDD Fix-Loop Redesign Implementation Plan

Goal: Make subagent-driven-development's review-fix loop convergent and autonomous (resume-the-implementer fix rounds, scoped re-reviews, five-round breaker, controller adjudication) and reorganize its SKILL.md by lifecycle — with quorum eval evidence. The superpowers repo (branch sdd-fix-loop-redesign, already created; spec committed) gets the skill restructure: one new prompt template, two template edits, one reference edit, and the SKILL.md rewrite whose full text is in Ta