Summary

• adds a self-contained collaborative-research-editor/ module for issue #12
• implements deterministic document operations for Markdown, LaTeX, code, notebook cells, comments, suggestions, tasks, live presence, section locks, and version snapshots
• adds a browser demo, API server, tests, README, SVG demo, and MP4 demo artifact

/claim #12

Demo

• Run locally with cd collaborative-research-editor && npm start, then open http://localhost:4127
• Demo video: collaborative-research-editor/docs/demo/collaborative-research-editor-demo.mp4
• Demo SVG: collaborative-research-editor/docs/demo/collaborative-research-editor.svg

Verification

• npm test
• node -e "fetch('http://localhost:4127/api/document').then(r=>r.json()).then(j=>console.log(j.manifest.blockCount, j.manifest.openComments, j.manifest.openTasks))"
• Browser demo verified locally at http://localhost:4127; workflow buttons update review state and browser console has no errors.