feat(engineering-team): add a11y-audit skill — WCAG 2.2 accessibility audit & fix (#376)
Built from scratch (replaces reverted PR #375 contribution).
Skill package:
- SKILL.md: 1132 lines, 3-phase workflow (scan → fix → verify),
per-framework fix patterns (React, Next.js, Vue, Angular, Svelte, HTML),
CI/CD integration guide, 20+ issue type coverage
- scripts/a11y_scanner.py: static scanner detecting 20+ violation types
across HTML/JSX/TSX/Vue/Svelte/CSS — severity-ranked, CI-friendly exit codes
- scripts/contrast_checker.py: WCAG contrast calculator with AA/AAA checks,
--suggest mode, --batch CSS scanning, named color support
- references/wcag-quick-ref.md: WCAG 2.2 Level A/AA criteria table
- references/aria-patterns.md: ARIA roles, live regions, keyboard interaction
- references/framework-a11y-patterns.md: React, Vue, Angular, Svelte fix patterns
- assets/sample-component.tsx: sample file with intentional violations
- expected_outputs/: scan report, contrast output, JSON output samples
- /a11y-audit slash command, settings.json, plugin.json, README.md
Validation: 97.6/100 (EXCELLENT), quality 73.9/100 (B-), scripts 2/2 PASS
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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