v1.9.1: Default provider changed to OpenAI (gpt-4o-mini)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: caswelltom

settings.php

@@ -55,7 +55,7 @@
         'local_ai_course_assistant/provider',
         get_string('settings:provider', 'local_ai_course_assistant'),
         get_string('settings:provider_desc', 'local_ai_course_assistant'),
-        'claude',
+        'openai',
         $providers
     ));
 

version.php

@@ -25,7 +25,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 $plugin->component = 'local_ai_course_assistant';
-$plugin->version = 2026030930;
+$plugin->version = 2026030931;
 $plugin->requires = 2024100700; // Moodle 4.5+.
 $plugin->maturity = MATURITY_STABLE;
-$plugin->release = '1.9.0';
+$plugin->release = '1.9.1';