Add knowledge graph measurement harmonization guard

[tuanadr]

/claim #17

Summary

• Adds a self-contained knowledge graph measurement harmonization guard.
• Normalizes units, checks biological context, compares statistical endpoints, enforces evidence confidence, and suppresses unsafe comparable-edge recommendations.
• Emits JSON-LD review metadata, curator actions, deterministic audit digest, JSON/Markdown/SVG output, and a short MP4 demo.

Demo artifacts

• knowledge-graph-measurement-harmonization-guard/demo-output/harmonization-packet.json
• knowledge-graph-measurement-harmonization-guard/demo-output/curator-actions.md
• knowledge-graph-measurement-harmonization-guard/demo-output/demo.svg
• knowledge-graph-measurement-harmonization-guard/demo-output/demo.mp4

Validation

• node knowledge-graph-measurement-harmonization-guard/test.js
• node knowledge-graph-measurement-harmonization-guard/demo.js
• node --check knowledge-graph-measurement-harmonization-guard/index.js
• node --check knowledge-graph-measurement-harmonization-guard/test.js
• node --check knowledge-graph-measurement-harmonization-guard/demo.js
• node --check knowledge-graph-measurement-harmonization-guard/sample-data.js
• ffprobe -v error -show_entries format=duration,size -show_entries stream=codec_name,width,height -of default=noprint_wrappers=1 knowledge-graph-measurement-harmonization-guard/demo-output/demo.mp4
• git diff --check
• git diff --cached --check