feat: F015 shortlist management

3-panel Shortlists page with left list, center detail, right decision brief panel. AddToShortlistDialog wired into result feed cards and match detail. Full DRAFT→REVIEW_READY→FINALIZED workflow, AI-generated decision brief draft, duplicate prevention, and compare-view integration.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/domain/enums.ts

@@ -131,6 +131,9 @@ export type SensitivityLevel = typeof SensitivityLevel[keyof typeof SensitivityL
 
 // ── Shortlist Status ──────────────────────────────────────────────────────────
 export const ShortlistStatus = {
+  DRAFT: 'DRAFT',
+  REVIEW_READY: 'REVIEW_READY',
+  FINALIZED: 'FINALIZED',
   ACTIVE: 'ACTIVE',
   SHARED: 'SHARED',
   ARCHIVED: 'ARCHIVED',