Backend changes cherry-picked from ui-rewrite branch to enable feedback API endpoints for the Next.js staging UI. - chair_feedback DB table + API endpoints (GET/POST/PATCH) - Content checklists by appeal subtype injected into block-yod prompt - MCP tools for recording and listing chair feedback - Corpus analysis documentation (24 decisions) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>