Add research image integrity assistant

[haki203]

Summary

• Adds a distinct research image-integrity assistant slice for issue AI-Powered Research Assistant Suite #16.
• Flags duplicated manuscript image panels, missing raw-image provenance, missing processing logs, and scale-bar/pixel-size metadata mismatches.
• Emits deterministic reviewer decisions, required actions, JSON/Markdown/SVG reports, and a short MP4 demo artifact from synthetic data only.

Validation

• node research-image-integrity-assistant/test.js
• node research-image-integrity-assistant/demo.js
• node --check research-image-integrity-assistant/index.js
• node --check research-image-integrity-assistant/test.js
• node --check research-image-integrity-assistant/demo.js
• node --check research-image-integrity-assistant/sample-data.js
• ffmpeg decode check for research-image-integrity-assistant/reports/demo.mp4
• git diff --cached --check

No secrets, private images, patient data, external APIs, or network calls are used by the module.

/claim #16