Self-hosted auto-updates from Gitea via PUC + proprietary licence

Vendors YahnisElsts/plugin-update-checker v5.7 under vendor/ and wires
it to poll updates.json on the repo main branch. WP surfaces new
versions via Dashboard → Updates on its normal twice-daily cadence.

PUC is vendored (not a submodule) so Gitea's archive/main.zip — the
download target — includes it.

Also relicenses from GPL-2.0-or-later to a proprietary licence granting
use only to authorised sites, with all other rights reserved. Plugin
URI + Author URI switched from the placeholder github.com URL to the
canonical Gitea repo.

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

vendor/plugin-update-checker/Puc/v5p7/DebugBar/PluginExtension.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace YahnisElsts\PluginUpdateChecker\v5p7\DebugBar;
+
+use YahnisElsts\PluginUpdateChecker\v5p7\Plugin\UpdateChecker;
+
+if ( !class_exists(PluginExtension::class, false) ):
+
+	class PluginExtension extends Extension {
+		/** @var UpdateChecker */
+		protected $updateChecker;
+
+		public function __construct($updateChecker) {
+			parent::__construct($updateChecker, PluginPanel::class);
+
+			add_action('wp_ajax_puc_v5_debug_request_info', array($this, 'ajaxRequestInfo'));
+		}
+
+		/**
+		 * Request plugin info and output it.
+		 */
+		public function ajaxRequestInfo() {
+			//phpcs:ignore WordPress.Security.NonceVerification.Missing -- Nonce is checked in preAjaxRequest().
+			if ( !isset($_POST['uid']) || ($_POST['uid'] !== $this->updateChecker->getUniqueName('uid')) ) {
+				return;
+			}
+			$this->preAjaxRequest();
+			$info = $this->updateChecker->requestInfo();
+			if ( $info !== null ) {
+				echo 'Successfully retrieved plugin info from the metadata URL:';
+				//phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_print_r -- For debugging output.
+				echo '<pre>', esc_html(print_r($info, true)), '</pre>';
+			} else {
+				echo 'Failed to retrieve plugin info from the metadata URL.';
+			}
+			exit;
+		}
+	}
+
+endif;