feat: media usage finder and media-get tool

Usage search distinguishes certain (ID referenced) and possible (file URL
only) usages, hides titles the user cannot read, and keeps queries bounded.
MediaGuard checks per-attachment capabilities and refuses trashed media
unless the caller opts in.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

tests/Unit/Integrations/Media/MediaIntegrationTest.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace LIT\MCP\Tests\Unit\Integrations\Media;
+
+use LIT\MCP\Abilities\Ability;
+use LIT\MCP\ChangeLog\ChangeLog;
+use LIT\MCP\Integrations\Media\MediaIntegration;
+use LIT\MCP\Integrations\WordPress\Schema\ContentSchema;
+use LIT\MCP\Limits;
+use LIT\MCP\Tests\Unit\TestCase;
+use Mockery;
+
+final class MediaIntegrationTest extends TestCase
+{
+    /** Grows with Tasks 2–5 – keep in the order of abilities(). */
+    private const EXPECTED = [
+        'lit/media-get',
+    ];
+
+    public function testProvidesTheMediaAbilities(): void
+    {
+        $integration = new MediaIntegration(Mockery::mock(ContentSchema::class), Mockery::mock(ChangeLog::class), new Limits());
+
+        self::assertSame('media', $integration->id());
+        self::assertTrue($integration->isAvailable());
+        self::assertSame(self::EXPECTED, array_map(static fn (Ability $a): string => $a->name(), $integration->abilities()));
+
+        foreach ($integration->abilities() as $ability) {
+            self::assertFalse($ability->inputSchema()['additionalProperties'], $ability->name());
+        }
+    }
+}