refactor(compat): Capability-Interface, DiviFeature implementiert es

Grundlage der generischen Kompatibilitätsschicht für Fremd-Plugins mit inoffiziellen Schnittstellen (Plan docs/superpowers/plans/2026-11-06-kompatibilitaetsschicht.md).

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

tests/Unit/Compatibility/CapabilityTest.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Unit\Compatibility;
+
+use LIT\MCP\Compatibility\Capability;
+use LIT\MCP\Integrations\Divi\Release\DiviFeature;
+use PHPUnit\Framework\TestCase;
+
+final class CapabilityTest extends TestCase
+{
+    public function testDiviFeatureIsACapability(): void
+    {
+        self::assertInstanceOf(Capability::class, DiviFeature::PageRead);
+    }
+
+    public function testTheIdIsTheStableValueOfTheFeature(): void
+    {
+        self::assertSame('page-read', DiviFeature::PageRead->id());
+        self::assertSame('tb-write', DiviFeature::ThemeBuilderWrite->id());
+    }
+
+    public function testTheIdsAreUniqueAcrossTheDiviFeatures(): void
+    {
+        $ids = array_map(static fn (Capability $capability): string => $capability->id(), DiviFeature::cases());
+
+        self::assertCount(count(DiviFeature::cases()), array_unique($ids));
+    }
+
+    public function testWriteAndLabelStayAsTheyWere(): void
+    {
+        self::assertFalse(DiviFeature::PageRead->isWrite());
+        self::assertTrue(DiviFeature::PageWrite->isWrite());
+        self::assertSame('Seiten lesen', DiviFeature::PageRead->label());
+    }
+}