fix(a11y): ISSUE_TEMPLATE README.md diagram YAML header block accTitle/accDescr

[ashleyshaw]

Fix Pull Request

Linked issues

Closes #991

Summary

Adds the canonical YAML header block accTitle/accDescr to the Mermaid flowchart in .github/ISSUE_TEMPLATE/README.md, replacing the deprecated inline syntax that was missed during the Wave-5 Mermaid WCAG accessibility sweep.

Changes

• .github/ISSUE_TEMPLATE/README.md: converts the flowchart accTitle/accDescr from inline declarations (inside the diagram body) to the YAML header block format (--- delimiters before the flowchart TD line), consistent with instructions/mermaid.instructions.md v2.0 and all other diagrams in the repository.

Impact / Compatibility

• Runtime/behaviour changes: None — accessibility metadata only
• CI: validate:mermaid-accessibility should pass

Verification

• validate:mermaid-accessibility passes
• validate:mermaid-syntax passes
• Frontmatter version and last_updated bumped

Risk & Rollback

• Risk level: Minimal — documentation-only change
• Rollback plan: Revert commit

Changelog

Fixed

• .github/ISSUE_TEMPLATE/README.md Mermaid diagram now uses the YAML header block format for accTitle/accDescr, consistent with v2.0 standards. Closes fix(a11y): ISSUE_TEMPLATE README.md Mermaid diagram missing YAML header block accTitle/accDescr #991.

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Checklist (Global DoD / PR)

• All AC met and demonstrated
• Tests added/updated (N/A — accessibility metadata only)
• Accessibility checklist completed:
  • Semantic HTML and heading order verified
  • Keyboard navigation and visible focus states verified
  • ARIA used only where needed
  • Contrast and non-colour cues reviewed (WCAG 2.2 AA or higher)
• Docs/readme/changelog updated
• Security checklist completed:
  • No secrets/sensitive data introduced
• CI green; linked issues closed

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[github-actions]

Metadata governance

• Item: fix(a11y): ISSUE_TEMPLATE README.md diagram YAML header block accTitle/accDescr #993
• Assignee: ashleyshaw
• Milestone: fix(a11y): ISSUE_TEMPLATE README.md Mermaid diagram missing YAML header block `a
• Linked issues/PRs: fix(a11y): ISSUE_TEMPLATE README.md Mermaid diagram missing YAML header block accTitle/accDescr #991

[gemini-code-assist]

Code Review

This pull request modifies the Mermaid diagram in the issue template README by moving the accessibility attributes inside the flowchart block. The reviewer points out that this inline syntax violates the repository's guidelines, which require using a YAML header block with delimiters for accTitle and accDescr before the diagram type declaration, and provides a suggestion to correct this.

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[gemini-code-assist]

The current implementation uses the inline syntax for accTitle and accDescr inside the diagram body, which violates the repository's Mermaid instructions. According to instructions/mermaid.instructions.md (lines 36-43 and 66-71), every Mermaid diagram must use the YAML header block format with --- delimiters placed immediately after the opening fence and before the diagram type declaration (e.g., flowchart TD).

Please update the diagram to use the correct YAML header block format.

Suggested change

	flowchart TD
	accTitle: Issue template workflow
	accDescr: Shows how users select an issue template, auto-populated fields flow into issue creation, and automation routes the issue to labelling, project, and notification steps.
	---
	accTitle: Issue template workflow
	accDescr: Shows how users select an issue template, auto-populated fields flow into issue creation, and automation routes the issue to labelling, project, and notification steps.
	---
	flowchart TD

References

1. Every Mermaid block must include an accessibility header block placed immediately after the opening fence and before the diagram type declaration, using the --- delimiters. Inline attributes after the diagram type line are not allowed. ^(link)

[ashleyshaw]

Closing this PR — the approach it implements (converting to YAML --- front-matter headers) turns out to be the wrong fix.

GitHub's embedded Mermaid renderer does not support YAML front-matter (--- blocks before the diagram type). Diagrams using that format show a parse error instead of rendering. The correct format keeps accTitle and accDescr as inline statements inside the diagram body, directly after the diagram type declaration.

This is superseded by branch fix/mermaid-inline-accessibility-syntax, which:

• Fixes .github/ISSUE_TEMPLATE/README.md with the correct inline syntax
• Converts all other YAML-header Mermaid diagrams across the entire repo to inline format
• Updates scripts/validation/validate-mermaid-accessibility.js to reject YAML front-matter and give actionable errors
• Updates instructions/mermaid.instructions.md and the Mermaid prompt to document the correct format

Issue #991 will be closed by the new PR.

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