Add analysis variable provenance assistant

[tuanadr]

/claim #16

Summary

• Add analysis-variable-provenance-assistant, a focused AI-Powered Research Assistant Suite slice for pre-submission manuscript analysis provenance.
• Audit manuscript variables against data dictionary definitions, producing transforms, cohort filters, transform hashes, pipeline determinism/test status, and previous reproducibility attempts.
• Emit reviewer-ready findings, priority actions, reproducibility confidence scores, stable avpa_ digests, JSON/SVG demo outputs, and the required short H.264 MP4 demo artifact.

Non-overlap

This is not another broad assistant suite, protocol trace, evidence-grounding check, statistics review, gap planner, rebuttal pack, ethics/data-availability check, citation-context reconciliation, reporting-guideline checker, benchmark-leakage audit, or figure/table consistency module. It focuses on analysis-variable provenance from manuscript claim to data dictionary and transform lineage.

Demo artifact

• analysis-variable-provenance-assistant/demo-output/demo.mp4
• analysis-variable-provenance-assistant/demo-output/demo.svg
• analysis-variable-provenance-assistant/demo-output/provenance-audit.json

Validation

• node analysis-variable-provenance-assistant/test.js
• node analysis-variable-provenance-assistant/demo.js
• node --check analysis-variable-provenance-assistant/index.js
• node --check analysis-variable-provenance-assistant/test.js
• node --check analysis-variable-provenance-assistant/demo.js
• node --check analysis-variable-provenance-assistant/sample-data.js
• ffprobe -v error -show_entries format=duration,size -show_entries stream=codec_name,width,height -of default=noprint_wrappers=1 analysis-variable-provenance-assistant/demo-output/demo.mp4
• git diff --cached --check

AI-assisted with OpenAI Codex; reviewed and locally verified before submission.