Add profile credit consent visibility guard

[ethanmillerinvestments-code]

Summary

• Adds a dependency-free profile credit consent visibility guard for the Community & User Reputation System.
• Gates profile, citation-page, leaderboard, and institutional publication of CRediT credits, peer-review receipts, and reputation deltas based on active consent, ORCID/profile verification, anonymous-review windows, embargoes, private/sensitive evidence, and immutable receipts.
• Emits reviewer artifacts as JSON, Markdown, SVG, and MP4 from synthetic sample packets.

Non-overlap

This targets the profile-credit consent and visibility boundary. It does not implement the broader ledger, endorsement ring checks, leaderboard eligibility, badge renewal, civility scoring, review timeliness, recusal workflow, calibration workflow, edit history, or dataset reuse-credit lanes.

Validation

• npm run check
• npm test
• npm run demo
• ffprobe -v error -show_entries format=duration,size -show_entries stream=codec_name,width,height,pix_fmt -of default=noprint_wrappers=1 reports/demo.mp4
• git diff --check
• git diff --cached --check

/claim #15