feat(control-library): document-grouped batching, generation strategy tracking, sort by source

- Group chunks by regulation_code before batching for better LLM context
- Add generation_strategy column (ungrouped=v1, document_grouped=v2)
- Add v1/v2 badge to control cards in frontend
- Add sort-by-source option with visual group headers
- Add frontend page tests (18 tests)

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

admin-compliance/app/sdk/control-library/components/helpers.tsx

@@ -46,6 +46,7 @@ export interface CanonicalControl {
   category: string | null
   target_audience: string | null
   generation_metadata?: Record<string, unknown> | null
+  generation_strategy?: string | null
   created_at: string
   updated_at: string
 }
@@ -229,6 +230,16 @@ export function TargetAudienceBadge({ audience }: { audience: string | null }) {
   return <span className={`inline-flex items-center px-2 py-0.5 rounded text-xs font-medium ${config.bg}`}>{config.label}</span>
 }
 
+export function GenerationStrategyBadge({ strategy }: { strategy: string | null | undefined }) {
+  if (!strategy || strategy === 'ungrouped') {
+    return <span className="inline-flex items-center px-1.5 py-0.5 rounded text-xs font-medium bg-gray-100 text-gray-500">v1</span>
+  }
+  if (strategy === 'document_grouped') {
+    return <span className="inline-flex items-center px-1.5 py-0.5 rounded text-xs font-medium bg-emerald-100 text-emerald-700">v2</span>
+  }
+  return null
+}
+
 export function getDomain(controlId: string): string {
   return controlId.split('-')[0] || ''
 }