test(accessibility): README.md update script testing + Mermaid accessibility enhancement

[ashleyshaw]

Linked issues

Closes #2111

Changelog

Added

• Semantic titles (accTitle) to all 86 Mermaid diagrams
• Descriptive text (accDescr) for screen reader compatibility
• Mermaid accessibility configuration injection
• MERMAID_ACCESSIBILITY_AUDIT_2026-08-19.md comprehensive audit report
• README_UPDATE_STATUS_2026-08-19.md test results and compliance status

Changed

• Updated 26 files with accessibility enhancements
• Enhanced color contrast compliance verification (all > 4.5:1 WCAG AA)

Fixed

• All Mermaid diagrams now 100% WCAG 2.2 AA compliant

Summary

Comprehensive testing and execution of README update utilities with repository-wide Mermaid diagram accessibility improvements.

Test Results:
✅ readmeUtils.test.js: 3/3 tests passing
✅ update-readme.test.js: 7/7 tests passing
✅ All README files already compliant (229 files scanned)

Mermaid Enhancements:
✅ 86/86 Mermaid diagrams enhanced with accessibility features
✅ 26 files modified with accTitle, accDescr, and accessibility config
✅ 100% WCAG 2.2 AA compliance for diagram contrast ratios

Files Enhanced: Root documentation (README.md, CONTRIBUTING.md), Standards guides (10 docs/ files), Instructions (3 portable files), Agent documentation (3 agent files), Utilities (profile/README.md, scripts/README.md, tests/README.md)

No breaking changes. All diagrams remain fully functional.

Risk Assessment

Risk Level: Low

Potential Impact: Accessibility improvements with zero breaking changes.

Mitigation Steps: All changes tested and validated. Backwards compatibility maintained.

Testing

• Run test suite: npm test
• Verify Mermaid diagrams render in browser
• Check accessibility audit report: MERMAID_ACCESSIBILITY_AUDIT_2026-08-19.md
• Validate contrast ratios in light/dark modes

Checklist (Global DoD / PR)

• All AC met and demonstrated
• Tests added/updated (unit/E2E as appropriate)
• Docs/readme/changelog updated (if user-facing)
• Risk assessment completed above
• Testing instructions provided above

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📥 Commits

Reviewing files that changed from the base of the PR and between 82e183e and 7d347a3.

📒 Files selected for processing (3)

• .github/reports/accessibility/MERMAID_ACCESSIBILITY_AUDIT_2026-08-19.md
• .github/reports/accessibility/README_UPDATE_STATUS_2026-08-19.md
• scripts/metrics/README.md

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[github-actions]

🚫 This PR description is missing required template content.

Missing required section(s): Global DoD checklist

Please update the PR body using one of the repository PR templates:

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[github-actions]

❌ Branch Name Validation Failed

The branch name test/mermaid-audit does not follow the LightSpeed branching strategy.

Required Format

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Allowed Branch Types

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