Add content checklists for block-yod and chair feedback system

Addresses Dafna's observation that licensing decisions lack comprehensive
planning discussion. Systematic corpus analysis of all 24 training decisions
revealed the system learned writing style but not substantive content.

Changes:
- Corpus analysis of all 24 decisions (docs/corpus-analysis.md)
- 5 content checklists by appeal subtype injected into block-yod prompt
- chair_feedback DB table + API endpoints + MCP tools
- Feedback management page in Next.js UI (/feedback)
- Navigation updated with "הערות יו״ר" link

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web-ui/src/components/app-shell.tsx

@@ -26,6 +26,7 @@ const NAV_ITEMS: NavItem[] = [
   { href: "/",            label: "בית"         },
   { href: "/cases/new",   label: "תיק חדש"     },
   { href: "/training",    label: "אימון סגנון" },
+  { href: "/feedback",    label: "הערות יו״ר"  },
   { href: "/skills",      label: "מיומנויות"  },
   { href: "/diagnostics", label: "אבחון"       },
 ];