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Final audit rollup: 0 P0 / 1 P1 / 11 P2 / 14 P3 (26 total). Pa11y P1 decision: FIX-DEFER with concrete migration plan (6 acceptance criteria + 60-120 min estimate). Decision driven by 3-hypothesis analysis: (1) config-only swap surfaces new live-app violations (color-contrast on DevIndexBadge, region landmarks), (2) additive both-kept keeps handoff failures blocking CI, (3) deferred migration with proper sprint task is cleanest path. Both decision-matrix triggers from brief apply: risk of new failures without follow-up plan + new CI infra requirement (live dev server lifecycle). Carryforward audit: 9 items still open from Audit #2 (all P2/P3, no regressions). 11 Audit #2 items verified closed in this audit (bf84568aria fix, CTO-19 Lucide, Q.DEFER.001-004, quirks #62/#72/#80, cron, RUNBOOK.md). FIX-NOW this session: 0 commits (Pa11y deferred per matrix). FIX-NOW earlier in audit: 1 commit (823da29cspell inline). FIX-DEFER documented: 25. BLOCKED: 0. Verdict: GREEN — 0 P0, sole P1 is methodology audit-fidelity gap (Pa11y declared but not exercised against live code); axe-core via Playwright in Phase 7 provides actual a11y coverage with 0 real prod issues against DevIndexBadge temp feature. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>