Add promotion dossier export guard

[snkk2x-collab]

/claim #15

Summary

• add a self-contained promotion-dossier-export-guard package for the Community & User Reputation System
• validate synthetic institution-facing reputation and contribution dossier exports before release
• check contributor consent, opt-out handling, anonymous/double-blind reviewer redaction, semi-private review export authorization, CRediT evidence links, badge/reputation evidence freshness, and conflict-note redaction

Distinct scope

This is not a broad reputation ledger, CRediT taxonomy validator, contributor attestation module, review calibration slice, workload equity guard, leaderboard privacy guard, sybil detector, probation/reinstatement guard, appeal evidence guard, or peer-review recertification module. It focuses only on institution-facing dossier export readiness.

Reviewer artifacts

• promotion-dossier-export-guard/artifacts/promotion-dossier-results.json
• promotion-dossier-export-guard/artifacts/promotion-dossier-report.md
• promotion-dossier-export-guard/artifacts/promotion-dossier-summary.svg
• promotion-dossier-export-guard/artifacts/promotion-dossier-demo.mp4
• promotion-dossier-export-guard/artifacts/demo-transcript.md

Validation

• node scripts/demo.js
• node --test
• node --check src/index.js
• node --check scripts/demo.js
• node --check test/promotionDossierExportGuard.test.js
• git diff --check

Boundaries

Synthetic dossiers only. No institutional systems, HR systems, private profile stores, live reputation services, credentials, external APIs, or payment systems.

AI-assisted with OpenAI Codex; I reviewed and verified the isolated module before submission.