v3.4.4: Admin settings restructure + curl filelib fixes

Restructured admin settings into a SOLA category with 7 focused pages,
replacing the single scrolling page plus the obsolete JS-based tab hack.
All existing settings preserved, no DB migration, no capability changes.

Pages under Site admin > Plugins > Local plugins > SOLA (AI Course Assistant):
  General            Enabled toggle, remote config URL, version banner
  AI Provider & Models   Provider, key, model, temp, system prompt, tokens, history
  Content & RAG      RAG + embedding + chunk tuning + performance caps
  Safety & Moderation   Quiz hide, off-topic, wellbeing, integrity
  Engagement         Study plans, reminders, voice/realtime, surveys, usability, rubrics
  Branding & UI      Institution name, display name, welcome, avatar, position
  Integrations       FAQ/Zendesk, Redash, CDN, plugin self-update

Plus 7 external pages (Starter Editor, Survey Editor, Usability Testing Editor,
Rubric Editor, RAG Index, Plugin Updates, Integrity Checks) all listed under
the same SOLA category.

Bug fixes:
- update_admin.php and rag_admin.php reindex path threw "Class curl not found"
  fatal errors because \curl is not auto-loaded by Moodle. Added
  require_once($CFG->libdir . '/filelib.php') inside every class method that
  creates a \curl instance: plugin_updater, reminder_manager, zendesk_client,
  embedding_provider\base_embedding_provider, provider\base_provider.

- Removed the obsolete JS tab navigation hack and duplicated top save button
  script from the single settings page. Both are now redundant with the native
  multi-page admin category layout.

QA:
- All 7 new settings pages render HTTP 200 with zero errors and zero warnings
  over authenticated HTTP.
- All 9 admin external pages (analytics, token analytics, rubric editor,
  survey editor, usability testing editor, RAG admin, update admin, integrity
  admin, starter settings) render HTTP 200 with zero errors and zero warnings.
- 18 analytics methods, survey_manager, usertesting_manager, rubric_manager,
  and token_cost_manager all smoke tested without argument or signature errors.
- All 46 lang files lint clean. Mustache template sections still balanced.

CLAUDE.md updated to reflect new version.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: caswelltom

CLAUDE.md

@@ -12,7 +12,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 SOLA (Saylor Online Learning Assistant) is a Moodle local plugin that provides an AI-powered learning coach embedded in course pages. Students interact via a floating chat widget.
 
 - **Plugin component:** `local_ai_course_assistant`
-- **Current version:** `2026040901`, release `3.4.2`
+- **Current version:** `2026041101`, release `3.4.4`
 - **Source folder:** `~/Library/CloudStorage/Dropbox/!Saylor/aicoursetutor/ai_course_assistant/`
 - **Zip for upload:** `~/Library/CloudStorage/Dropbox/!Saylor/aicoursetutor/ai_course_assistant.zip`
 - **GitHub:** `https://github.com/saylordotorg/moodle-local_ai_course_assistant` (public)

classes/embedding_provider/base_embedding_provider.php

@@ -150,6 +150,8 @@ protected function log_embedding_cost(int $tokens): void {
      * @throws \moodle_exception On HTTP errors.
      */
     protected function http_post(string $url, array $headers, string $body): string {
+        global $CFG;
+        require_once($CFG->libdir . '/filelib.php'); // For \curl.
         $curl = new \curl();
         $curl->setopt([
             'CURLOPT_HTTPHEADER'    => $headers,

classes/plugin_updater.php

@@ -49,6 +49,8 @@ public static function get_current_version(): object {
      *                     or null on failure.
      */
     public static function check_for_update(): ?object {
+        global $CFG;
+        require_once($CFG->libdir . '/filelib.php'); // For \curl.
         $token = get_config('local_ai_course_assistant', 'github_token');
 
         $headers = [
@@ -116,6 +118,7 @@ public static function check_for_update(): ?object {
      */
     public static function download_release(string $zipurl): string {
         global $CFG;
+        require_once($CFG->libdir . '/filelib.php'); // For \curl.
 
         // Security: only download from github.com.
         if (strpos($zipurl, 'https://github.com/') !== 0

classes/provider/base_provider.php

@@ -94,6 +94,8 @@ abstract protected function get_default_base_url(): string;
      * @throws \moodle_exception On HTTP errors.
      */
     protected function http_post(string $url, array $headers, string $body): string {
+        global $CFG;
+        require_once($CFG->libdir . '/filelib.php'); // For \curl.
         $curl = new \curl();
         $curl->setopt([
             'CURLOPT_HTTPHEADER' => $headers,

classes/reminder_manager.php

@@ -253,7 +253,8 @@ public static function send_email_reminder(\stdClass $reminder, string $message)
      * @return bool Success.
      */
     public static function send_whatsapp_reminder(\stdClass $reminder, string $message): bool {
-        global $DB;
+        global $DB, $CFG;
+        require_once($CFG->libdir . '/filelib.php'); // For \curl.
 
         $apiurl = get_config('local_ai_course_assistant', 'whatsapp_api_url');
         $apitoken = get_config('local_ai_course_assistant', 'whatsapp_api_token');
@@ -370,6 +371,8 @@ private static function detect_whatsapp_provider(string $apiurl): string {
      * @return array ['success' => bool, 'httpcode' => int, 'response' => string, 'error' => string]
      */
     private static function send_twilio_whatsapp_message(array $config, string $destination, string $body): array {
+        global $CFG;
+        require_once($CFG->libdir . '/filelib.php'); // For \curl.
         $accountsid = self::extract_twilio_account_sid($config['apiurl']);
         if ($accountsid === '') {
             return [

classes/zendesk_client.php

@@ -54,7 +54,8 @@ public static function create_ticket(
         string $question,
         string $conversationsummary
     ): ?string {
-        global $DB;
+        global $DB, $CFG;
+        require_once($CFG->libdir . '/filelib.php'); // For \curl.
 
         if (!self::is_enabled()) {
             return null;

settings.php

@@ -25,7 +25,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 $plugin->component = 'local_ai_course_assistant';
-$plugin->version = 2026041001;
+$plugin->version = 2026041101;
 $plugin->requires = 2024100700; // Moodle 4.5+.
 $plugin->maturity = MATURITY_STABLE;
-$plugin->release = '3.4.3';
+$plugin->release = '3.4.4';