Add follow and unfollow stubs to WordPress adapter

Introduces follow and unfollow methods to the WordPress adapter class. These methods are currently pass-throughs, reflecting the read-only nature of core feeds, and provide a consistent interface for future extensibility.

Author: pfefferle

includes/adapters/class-wordpress.php

@@ -101,6 +101,34 @@ public function get_following( $result, $channel, $user_id ) { // phpcs:ignore G
 		return $result;
 	}
 
+	/**
+	 * Follow a URL (not supported for core feeds).
+	 *
+	 * @param array|null $result  Current result or null.
+	 * @param string     $channel Channel UID.
+	 * @param string     $url     URL to follow.
+	 * @param int        $user_id The user ID.
+	 * @return array|null
+	 */
+	public function follow( $result, $channel, $url, $user_id ) { // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.FoundAfterLastUsed
+		// Read-only adapter; pass through.
+		return $result;
+	}
+
+	/**
+	 * Unfollow a URL (not supported for core feeds).
+	 *
+	 * @param bool|null $result  Current result or null.
+	 * @param string    $channel Channel UID.
+	 * @param string    $url     URL to unfollow.
+	 * @param int       $user_id The user ID.
+	 * @return bool|null
+	 */
+	public function unfollow( $result, $channel, $url, $user_id ) { // phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.FoundAfterLastUsed
+		// Read-only adapter; pass through.
+		return $result;
+	}
+
 	/**
 	 * Read WordPress.org news feed items.
 	 *