refactor: Rev::matches replaces the inline rev checks

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

src/Abilities/Rev.php

@@ -32,4 +32,14 @@ final class Rev
             (string) $post->post_modified_gmt,
         ]));
     }
+
+    /**
+     * Whether $input carries the current rev of $post (optimistic lock of the post tools).
+     *
+     * @param array<string, mixed> $input
+     */
+    public static function matches(array $input, WP_Post $post): bool
+    {
+        return isset($input['rev']) && $input['rev'] === self::ofPost($post);
+    }
 }