Release candidate 1.5.5-rc.1

Version header for a prerelease tag that exercises release.yml end to end
inside the shared CI image. Gitea flags hyphenated versions as prereleases
and UpdateChecker reads /releases/latest, which excludes them, so no site is
offered this build.

Deliberately not merged to main: main stays on 1.5.5, and the release
workflow skips its version-bump job for hyphenated tags.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01D9acV1mHktGAb1uyvNmrR2

unsupervised-schedular.php

@@ -3,7 +3,7 @@
  * Plugin Name: Unsupervised Scheduler
  * Plugin URI:  https://git.unsupervised.ca/Unsupervised/unsupervised-scheduler
  * Description: Instructor/student lesson scheduling for WordPress.
- * Version:     1.5.5
+ * Version:     1.5.5-rc.1
  * Requires at least: 6.2
  * Requires PHP: 8.1
  * Author:      Unsupervised
@@ -21,7 +21,7 @@ if (! defined('ABSPATH')) {
     exit;
 }
 
-define('USC_VERSION', '1.5.5');
+define('USC_VERSION', '1.5.5-rc.1');
 define('USC_PLUGIN_FILE', __FILE__);
 define('USC_PLUGIN_DIR', plugin_dir_path(__FILE__));
 define('USC_PLUGIN_URL', plugin_dir_url(__FILE__));