[Child] Audit: Mermaid Diagram Accessibility (WCAG AA, Light/Dark)

[ashleyshaw]

Parent Issue: #905

Overview

Audit Mermaid accessibility in README diagrams against WCAG AA-aligned expectations.

In-Scope

• accTitle and accDescr presence
• Legibility and contrast checks in light/dark contexts

Audit Checklist

• Accessibility metadata reviewed for each diagram
• Contrast/readability issues documented
• Accessibility remediation actions proposed

Deliverables

• Mermaid accessibility audit report

Related Files

• README files containing Mermaid diagrams
• instructions/a11y.instructions.md

[linear-code]

LS-986