Add collaborative equation anchor guard

[keon0711]

/claim #12

Summary

• Add a self-contained collaborative equation anchor integrity guard for the real-time research editor.
• Detect duplicate equation labels, stale \ref{...} anchors, journal numbering drift, locked-section equation mutations, and unresolved private reviewer equation comments before manuscript export.
• Produce deterministic allow/hold/remediation decisions with audit digests and reviewer-ready artifacts.
• Use synthetic data only: no private manuscripts, credentials, browser storage, identity-provider calls, or external APIs.

Demo artifacts

• collaborative-equation-anchor-guard/reports/demo.mp4
• collaborative-equation-anchor-guard/reports/equation-anchor-review.svg
• collaborative-equation-anchor-guard/reports/equation-anchor-review.md
• collaborative-equation-anchor-guard/reports/equation-anchor-review.json

Validation

node collaborative-equation-anchor-guard/test.js
node collaborative-equation-anchor-guard/demo.js
node collaborative-equation-anchor-guard/render-video.js
node --check collaborative-equation-anchor-guard/index.js
node --check collaborative-equation-anchor-guard/sample-data.js
node --check collaborative-equation-anchor-guard/test.js
node --check collaborative-equation-anchor-guard/demo.js
node --check collaborative-equation-anchor-guard/render-video.js
git diff --check
ffprobe -v error -show_entries format=duration,size -of default=nw=1 collaborative-equation-anchor-guard/reports/demo.mp4

All commands passed locally. The generated MP4 reports duration=4.000000 and size=36758.

Scope distinction

This focuses on equation labels and cross-references during collaborative edits. It avoids existing broad editor, notebook/kernel, reference formatting, figure/table, clipboard/import, find/replace, chat mention, footnote export, suggestion provenance, section-lock, and mode-toggle slices.

[keon0711]

@algora-pbc /claim #12