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/api/sdk/v1/canonical/route.ts

@@ -25,22 +25,35 @@ export async function GET(request: NextRequest) {
         break
 
       case 'controls': {
-        const severity = searchParams.get('severity')
-        const domain = searchParams.get('domain')
-        const verificationMethod = searchParams.get('verification_method')
-        const categoryFilter = searchParams.get('category')
-        const targetAudience = searchParams.get('target_audience')
-        const params = new URLSearchParams()
-        if (severity) params.set('severity', severity)
-        if (domain) params.set('domain', domain)
-        if (verificationMethod) params.set('verification_method', verificationMethod)
-        if (categoryFilter) params.set('category', categoryFilter)
-        if (targetAudience) params.set('target_audience', targetAudience)
-        const qs = params.toString()
+        const controlParams = new URLSearchParams()
+        const passthrough = ['severity', 'domain', 'verification_method', 'category',
+          'target_audience', 'source', 'search', 'sort', 'order', 'limit', 'offset']
+        for (const key of passthrough) {
+          const val = searchParams.get(key)
+          if (val) controlParams.set(key, val)
+        }
+        const qs = controlParams.toString()
         backendPath = `/api/compliance/v1/canonical/controls${qs ? `?${qs}` : ''}`
         break
       }
 
+      case 'controls-count': {
+        const countParams = new URLSearchParams()
+        const countPassthrough = ['severity', 'domain', 'verification_method', 'category',
+          'target_audience', 'source', 'search']
+        for (const key of countPassthrough) {
+          const val = searchParams.get(key)
+          if (val) countParams.set(key, val)
+        }
+        const countQs = countParams.toString()
+        backendPath = `/api/compliance/v1/canonical/controls-count${countQs ? `?${countQs}` : ''}`
+        break
+      }
+
+      case 'controls-meta':
+        backendPath = '/api/compliance/v1/canonical/controls-meta'
+        break
+
       case 'control': {
         const controlId = searchParams.get('id')
         if (!controlId) {