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/ReleaseGate.php

@@ -92,16 +92,6 @@ final class ReleaseGate
         }
     }
 
-    /**
-     * Every writing feature (CompatibilityMatrix::writeFeatures()) – for callers that know no feature.
-     *
-     * @throws DiviLocked
-     */
-    public static function assertWritable(?int $postId = null): void
-    {
-        self::assertFeatures(CompatibilityMatrix::writeFeatures(), $postId);
-    }
-
     public static function whileProbing(int $postId, callable $write): mixed
     {
         $previous = self::$probe;