Add reputation appeal evidence guard

[shaiananvari8]

Summary

• add a self-contained reputation appeal evidence guard for the Community & User Reputation System
• evaluate appeal packets for missing evidence, conflicted reviewers, same-actor appeal decisions, expired appeal windows, and overlong reinstatement probation
• include deterministic reviewer artifacts: JSON packet, Markdown report, and SVG summary

Verification

• npm test from reputation-appeal-evidence-guard
• npm run demo from reputation-appeal-evidence-guard

Demo evidence

• reputation-appeal-evidence-guard/reports/appeal-evidence-report.md
• reputation-appeal-evidence-guard/reports/appeal-evidence-packet.json
• reputation-appeal-evidence-guard/reports/summary.svg

/claim #15