/claim #12

Summary

Adds a self-contained collaborative LaTeX macro safety guard for the real-time collaborative research editor.

This slice validates synchronized Markdown/LaTeX editor packets before live preview or named-version export by checking:

• conflicting collaborator macro definitions
• unsafe macro commands such as raw HTML helpers, links, and image/resource includes
• recursive macro expansion cycles that can hang live render/export
• unapproved macro edits in shared named versions
• raw active HTML and unapproved external render resources in Markdown/LaTeX blocks
• locked-section render holds when risky macro packets affect controlled sections

Non-overlap

This targets collaborative LaTeX/KaTeX macro render safety. It does not implement a broad editor foundation, operation replay, offline conflict handling, notebook workbench/kernel lease, reference formatting or reference merge, authorship governance, freeze/recovery, discussion sidebar, autosave, round-trip fidelity, review decision gates, task dependency, equation/figure anchors, presence privacy/liveness, accessibility, manuscript evidence binding, embargo release, or notification visibility.

Safety

• Synthetic fixtures only in collaborative-latex-macro-safety-guard/sample-data.js
• No live users, private manuscripts, browser sessions, credentials, external services, wallet material, or payment data
• Dependency-free evaluator/tests; ffmpeg is only optional for regenerating the committed demo video

Demo artifacts

• collaborative-latex-macro-safety-guard/reports/demo.json
• collaborative-latex-macro-safety-guard/reports/demo.md
• collaborative-latex-macro-safety-guard/reports/demo.svg
• collaborative-latex-macro-safety-guard/reports/demo.mp4

Validation

• npm run check
• npm test
• npm run demo
• npm run demo:video with FFMPEG_PATH pointing to a temporary ffmpeg-static binary outside the repo
• ffmpeg -v error -i collaborative-latex-macro-safety-guard/reports/demo.mp4 -f null -
• git diff --check
• git diff --cached --check
• rg -n "token|secret|password|private key|BEGIN|sk-|ghp_|github_pat|wallet|seed phrase" README.md collaborative-latex-macro-safety-guard -> no matches