Add uncertainty calibration assistant

[HunterCML]

/claim #16

Summary

• add dependency-free uncertainty calibration assistant for AI-powered research review
• calibrate manuscript claim wording against evidence score, confidence intervals, replication status, declared confidence, and limitation disclosures
• emit peer-review findings, reproducibility confidence, research-gap opportunities, reviewer artifacts, SVG preview, and H.264 demo video

Validation

• node uncertainty-calibration-assistant/test.js
• node uncertainty-calibration-assistant/demo.js
• node --check uncertainty-calibration-assistant/index.js
• node --check uncertainty-calibration-assistant/test.js
• node --check uncertainty-calibration-assistant/demo.js
• ffprobe -v error -show_entries format=duration,size -show_entries stream=codec_name,width,height -of default=noprint_wrappers=1 uncertainty-calibration-assistant/demo.mp4
• git diff --check