fix: ensure JSONB array fields are always arrays in control API

Backend: _ensure_list() converts null/string/malformed JSONB to []
for requirements, test_procedure, evidence, open_anchors, tags.

Frontend: defensive Array.isArray() check on ControlDetail.tsx.

Fixes: TypeError: A.requirements.map is not a function

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

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

@@ -212,14 +212,14 @@ export function ControlDetail({
           </section>
         ) : null}
 
-        {ctrl.requirements.length > 0 && (
+        {Array.isArray(ctrl.requirements) && ctrl.requirements.length > 0 && (
           <section>
             <h3 className="text-sm font-semibold text-gray-900 mb-2">Anforderungen</h3>
             <ol className="list-decimal list-inside space-y-1">{ctrl.requirements.map((r, i) => <li key={i} className="text-sm text-gray-700">{r}</li>)}</ol>
           </section>
         )}
 
-        {ctrl.test_procedure.length > 0 && (
+        {Array.isArray(ctrl.test_procedure) && ctrl.test_procedure.length > 0 && (
           <section>
             <h3 className="text-sm font-semibold text-gray-900 mb-2">Pruefverfahren</h3>
             <ol className="list-decimal list-inside space-y-1">{ctrl.test_procedure.map((s, i) => <li key={i} className="text-sm text-gray-700">{s}</li>)}</ol>