feat(wpmc S7): vendor Plugin Update Checker v5.6

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

includes/lib/plugin-update-checker/Puc/v5p6/Vcs/Reference.php

@@ -0,0 +1,51 @@
+<?php
+namespace YahnisElsts\PluginUpdateChecker\v5p6\Vcs;
+
+if ( !class_exists(Reference::class, false) ):
+
+	/**
+	 * This class represents a VCS branch or tag. It's intended as a read only, short-lived container
+	 * that only exists to provide a limited degree of type checking.
+	 *
+	 * @property string $name
+	 * @property string|null version
+	 * @property string $downloadUrl
+	 * @property string $updated
+	 *
+	 * @property string|null $changelog
+	 * @property int|null $downloadCount
+	 */
+	class Reference {
+		private $properties = array();
+
+		public function __construct($properties = array()) {
+			$this->properties = $properties;
+		}
+
+		/**
+		 * @param string $name
+		 * @return mixed|null
+		 */
+		public function __get($name) {
+			return array_key_exists($name, $this->properties) ? $this->properties[$name] : null;
+		}
+
+		/**
+		 * @param string $name
+		 * @param mixed $value
+		 */
+		public function __set($name, $value) {
+			$this->properties[$name] = $value;
+		}
+
+		/**
+		 * @param string $name
+		 * @return bool
+		 */
+		public function __isset($name) {
+			return isset($this->properties[$name]);
+		}
+
+	}
+
+endif;