Add PHPStan object shape typing for WP_Post_Type::$cap and WP_Taxonomy::$cap

Document the well-known capability properties via @phpstan-var object{...}
so static analysis can verify capability access on these properties.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: westonruter

src/wp-includes/class-wp-post-type.php

@@ -339,6 +339,24 @@ final class WP_Post_Type {
 	 *
 	 * @since 4.6.0
 	 * @var stdClass $cap
+	 *
+	 * @phpstan-var object{
+	 *     edit_post: string,
+	 *     read_post: string,
+	 *     delete_post: string,
+	 *     edit_posts: string,
+	 *     edit_others_posts: string,
+	 *     delete_posts: string,
+	 *     publish_posts: string,
+	 *     read_private_posts: string,
+	 *     create_posts: string,
+	 *     read?: string,
+	 *     delete_private_posts?: string,
+	 *     delete_published_posts?: string,
+	 *     delete_others_posts?: string,
+	 *     edit_private_posts?: string,
+	 *     edit_published_posts?: string,
+	 * }
 	 */
 	public $cap;
 

src/wp-includes/class-wp-taxonomy.php

@@ -162,6 +162,13 @@ final class WP_Taxonomy {
 	 *
 	 * @since 4.7.0
 	 * @var stdClass
+	 *
+	 * @phpstan-var object{
+	 *     manage_terms: string,
+	 *     edit_terms: string,
+	 *     delete_terms: string,
+	 *     assign_terms: string,
+	 * }
 	 */
 	public $cap;