feat: 3 accessibility specialist skills for marketplace

[LucasSantana-Dev]

Summary

• 3 new SKILL.md files for the skill marketplace (PR feat: Anthropic Agent Skills spec compatibility #388 system)
• siza-color-contrast-checker: WCAG 2.1 AA/AAA contrast ratios, dark mode, color blindness, semantic token validation
• siza-keyboard-nav-auditor: Tab order, focus management, keyboard traps, ARIA APG patterns, skip navigation
• siza-semantic-html-reviewer: Heading hierarchy, landmark regions, ARIA roles, lists/tables/forms semantics
• Complements existing siza-accessibility-audit (general) with deep specialist expertise
• Inspired by accessibility-agents (11 WCAG specialists)

Test plan

• All 3 SKILL.md files parse correctly (valid YAML frontmatter)
• Pre-commit gate passes (lint-staged + type-check)
• No code changes — skills are static .md files
• No bundle size impact

[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (4)

• .serena/memories/project_overview.md is excluded by !**/*.md
• skills/siza-color-contrast-checker/SKILL.md is excluded by !**/*.md
• skills/siza-keyboard-nav-auditor/SKILL.md is excluded by !**/*.md
• skills/siza-semantic-html-reviewer/SKILL.md is excluded by !**/*.md

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Review profile: CHILL

Plan: Pro

Run ID: 69d4782a-ad11-496c-8ad3-c9b263b47b60

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/a11y-specialist-skills

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Project Scorecard

Scorecard: 82/100
────────────────────────────────────────
  security: 100/100
  quality: 80/100 (1 violations)
  performance: 67/100 (1 violations)
  compliance: 75/100 (1 violations)

Recommendations:
  - Increase test coverage to meet the 80% threshold
  - Extend log retention to at least 90 days for compliance