[Child] Audit: Validate Mermaid Syntax in All Diagrams

[ashleyshaw]

Parent Issue: #905

Overview

Validate Mermaid syntax in all in-scope README diagrams.

In-Scope

• Mermaid code blocks in README files

Audit Checklist

• Mermaid blocks extracted
• Syntax validated
• Parse/render failures documented with fix hints

Deliverables

• Mermaid syntax validation report

Related Files

• README files containing Mermaid diagrams

[linear-code]

LS-985