refactor: Übergangs-API der Gesamtsperre entfernt (assertWritable, writable, refusal, writeFeatures, released); DiviLocked verlangt die gesperrten Fähigkeiten, Tests bauen Zustände über ReleaseMatrices

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/Integrations/Divi/Release/CompatibilityMatrix.php

@@ -59,15 +59,6 @@ final class CompatibilityMatrix
         return new self($features);
     }
 
-    /** @return list<DiviFeature> The features that write (ReleaseGate::assertWritable(), ReleaseStatus::writable()). */
-    public static function writeFeatures(): array
-    {
-        return array_values(array_filter(
-            DiviFeature::cases(),
-            static fn (DiviFeature $feature): bool => $feature->isWrite()
-        ));
-    }
-
     public function of(DiviFeature $feature): FeatureStatus
     {
         return $this->features[$feature->value];