refactor: annotation presets (L5)

The 41 abilities return Annotations::read(), ::write(idempotent) or
::destructive(idempotent) instead of hand-written arrays (same arrays, same
key order).

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

src/Integrations/Media/MediaGetAbility.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace LIT\MCP\Integrations\Media;
 
 use LIT\MCP\Abilities\Ability;
+use LIT\MCP\Abilities\Annotations;
 use WP_Error;
 
 final class MediaGetAbility implements Ability
@@ -56,7 +57,7 @@ final class MediaGetAbility implements Ability
 
     public function annotations(): array
     {
-        return ['readonly' => true, 'destructive' => false, 'idempotent' => true];
+        return Annotations::read();
     }
 
     public function isDirect(): bool