Summary

• Adds a self-contained artifact preview cache and version guard for issue #14.
• Classifies hosted datasets, code, images, media, models, and supplemental artifacts into preview lanes.
• Detects stale previews when content hashes, upload versions, schema versions, or metadata digests drift.
• Holds unsafe previews that expose sensitive fields and emits dataset diff summaries, FAIR warnings, preview plans, and a deterministic audit digest.
• Includes a short H.264 demo artifact at artifact-preview-cache-guard/demo.mp4.

Validation

• node artifact-preview-cache-guard/test.js
• node artifact-preview-cache-guard/demo.js
• node --check artifact-preview-cache-guard/index.js
• node --check artifact-preview-cache-guard/test.js
• node --check artifact-preview-cache-guard/demo.js
• ffprobe -v error -show_entries format=duration,size -show_entries stream=codec_name,width,height -of default=noprint_wrappers=1 artifact-preview-cache-guard/demo.mp4
• git diff --check
• git diff --cached --check

/claim #14

Built with AI assistance; reviewed and tested before submission.