feat: batch media metadata updates and delete with usage check

lit/media-update validates the whole batch first (edit_post, lengths, optional
modified lock) and restores already written items when a write fails midway.
lit/media-delete requires confirm, refuses used media without force and
reports refused deletes as write_failed.

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

src/Integrations/Media/MediaIntegration.php

@@ -11,7 +11,7 @@ use LIT\MCP\Limits;
 
 /**
  * Media library tools (spec §6.3). Always available. $log and $limits serve the write
- * tools (upload now, update and delete to follow).
+ * tools (upload, update, delete).
  */
 final class MediaIntegration implements Integration
 {
@@ -43,6 +43,8 @@ final class MediaIntegration implements Integration
             new MediaUploadFromUrlAbility($importer, $uploads),
             new MediaUploadAbility($importer, $uploads, $this->limits),
             new MediaDownloadAbility($this->limits),
+            new MediaUpdateAbility($this->log),
+            new MediaDeleteAbility($finder, $this->log),
         ];
     }
 }