Add knowledge graph recommendation visibility guard

[swhan0329]

Summary

• Adds a self-contained knowledge graph recommendation visibility guard for issue Scientific Knowledge Graph Integration #17.
• Evaluates graph recommendation paths against public, institutional, project, private, embargoed, and restricted node/evidence access.
• Suppresses unsafe recommendations, keeps safe paths visible, emits curator actions, and produces a deterministic audit digest for explainable discovery behavior.
• Includes a short H.264 demo artifact at knowledge-graph-recommendation-visibility-guard/demo.mp4.

Validation

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

/claim #17

Built with AI assistance; reviewed and tested before submission.

[swhan0329]

@algora-pbc /claim #17

[swhan0329]

/claim #17