Add scientific roundtrip fidelity checker

[IOROHKI]

/claim #12

Summary

• Adds a focused scientific round-trip fidelity checker for SCIBASE issue Real-time collaborative research editor & interface #12.
• Compares canonical collaborative manuscript blocks against Markdown, LaTeX, and notebook export/import snapshots.
• Flags lost equations, citation keys, figure/table anchors, table columns, notebook cell outputs, execution counts, unresolved suggestions, comments, and cross-reference edges before publication export.
• Produces reviewer repair queues, deterministic audit packets, JSON/Markdown/SVG outputs, and a short MP4 demo artifact.

@algora-pbc /claim #12

Demo

• Short demo video: scientific-roundtrip-fidelity-checker/reports/demo.mp4
• SVG preview: scientific-roundtrip-fidelity-checker/reports/roundtrip-fidelity.svg
• Audit packet: scientific-roundtrip-fidelity-checker/reports/roundtrip-audit.json

Validation

• node scientific-roundtrip-fidelity-checker/test.js
• node scientific-roundtrip-fidelity-checker/demo.js
• node --check scientific-roundtrip-fidelity-checker/index.js
• node --check scientific-roundtrip-fidelity-checker/sample-data.js
• node --check scientific-roundtrip-fidelity-checker/demo.js
• node --check scientific-roundtrip-fidelity-checker/test.js
• git diff --check
• MP4 verification: imageio-ffmpeg decoded scientific-roundtrip-fidelity-checker/reports/demo.mp4 without errors

Notes

• Synthetic data only.
• No credentials, network calls, or external runtime dependencies in the module.
• This slice is distinct from broad editor foundations, offline conflict resolution, notebook collaboration, reference formatting, authorship governance, freeze/lock/recovery lanes, figure/table review, discussion sidebar audit, and autosave recovery.

[IOROHKI]

@algora-pbc /claim #12