Add review retaliation guard

[pine-harbor]

/claim #15

Summary

Adds review-retaliation-guard, a focused reputation-system guard for detecting and freezing post-critical-review retaliation before reputation deltas, badges, endorsements, leaderboards, or public profile exports are applied.

This slice is intentionally narrow for the Community & User Reputation System: after someone leaves a critical review, it asks whether affiliated authors, labs, institutions, funders, or study-team actors punished that reviewer inside a cooling-off window.

What It Covers

• Critical review detection from recommendation, rating, tone, or criticality score.
• Author/coauthor/lab/institution/funder/study-team relationship checks for reputation actors.
• Punitive events such as downvotes, reputation penalties, badge removal, endorsement withdrawal, role revocation, reviewer blocking, and profile visibility reduction.
• Coercive message detection when a reputation event pressures the reviewer to soften criticism.
• Clustered retaliation bursts from multiple affiliated actors.
• Public reputation export freezes while retaliation risk is unresolved.
• Independent moderator review and appeal-window checks.

Included Artifacts

• Dependency-free Node module: review-retaliation-guard/src/index.js
• Synthetic sample packet data: review-retaliation-guard/data/sample_reputation_events.json
• Tests: review-retaliation-guard/test/review-retaliation-guard.test.js
• Demo/report generator: review-retaliation-guard/scripts/demo.js
• Generated reviewer packet, JSON summary, SVG summary, and MP4 slate in review-retaliation-guard/reports/

Validation

• npm.cmd test: 6 tests passed.
• npm.cmd run check: syntax checks passed.
• npm.cmd run demo: generated 4-packet report with CLEAR: 2, REVIEW: 0, HOLD: 2.
• npm.cmd run video: generated reports/demo.mp4.
• git diff --check: passed.
• ffprobe: H.264, 1280x720, 8.000 seconds, 30 fps, 240 frames.

The MP4 is a generated FFmpeg color-source/drawtext slate, not a desktop or browser recording. It contains no private data.