Summary

/claim #12

Adds a focused collab-editor-accessibility-parity-guard module for the real-time collaborative research editor. This checks whether Markdown, WYSIWYG, LaTeX, notebook, comment, suggestion, and section-lock controls are accessible before a collaborative manuscript is released.

This is intentionally separate from existing broad editor, operation replay, offline conflict, notebook workbench, reference formatting, authorship governance, freeze/lock/recovery, discussion sidebar, autosave, round-trip fidelity, review decision, task dependency, equation/figure anchor, kernel lease, and presence-privacy slices.

What it checks

• keyboard reachability for interactive editor controls
• screen-reader labels for toolbars, comments, suggestions, locks, and notebook cells
• spoken text for LaTeX equation blocks
• alt text for visual notebook outputs
• comment/suggestion document anchors
• lock/unlock screen-reader announcements
• Markdown/WYSIWYG mode parity
• focus-order coverage and unknown focus targets

Validation

• node collab-editor-accessibility-parity-guard/test.js -> 5 tests passed
• node collab-editor-accessibility-parity-guard/demo.js -> status=hold_accessibility_release, blockers=6, warnings=3
• node --check collab-editor-accessibility-parity-guard/index.js collab-editor-accessibility-parity-guard/sample-data.js collab-editor-accessibility-parity-guard/test.js collab-editor-accessibility-parity-guard/demo.js -> passed
• git diff --check -> passed
• ffprobe confirmed reports/demo.mp4 is H.264, 1280x720, 12s

Artifacts

• collab-editor-accessibility-parity-guard/reports/accessibility-parity-packet.json
• collab-editor-accessibility-parity-guard/reports/accessibility-parity-report.md
• collab-editor-accessibility-parity-guard/reports/summary.svg
• collab-editor-accessibility-parity-guard/reports/demo.mp4

Synthetic data only; no credentials, browser automation, external APIs, or notebook execution.