Fix semester context, attendance rosters, and billing workflows

- load global semester helpers consistently and use date-based semester defaults
- fix grading and daily attendance duplicate student/section rows
- keep attendance violations scoped to the current semester by default
- update invoice, refund, discount, payment, and financial aid flows
- add configuration cleanup migrations for duplicate calendar/semester keys
- refresh parent registration/report-card and print request handling
- update related models, services, views, cron notes, and test coverage

app/Commands/ConfigUpdate.php

@@ -98,10 +98,9 @@ class ConfigUpdate extends BaseCommand
             return true; // no-op is success
         }
 
-        CLI::write("Set semester = Spring" . ($dry ? ' [DRY]' : ''), 'light_gray');
-        if ($dry) return true;
+        CLI::write('Semester is derived from fall_semester_start and spring_semester_start; no config row is updated.', 'yellow');
 
-        return (bool) $this->configModel->setConfigValueByKey('semester', 'Spring');
+        return true;
     }
 
     protected function taskSetSemesterFall(bool $dry, DateTimeZone $tz): bool
@@ -118,10 +117,9 @@ class ConfigUpdate extends BaseCommand
             return true;
         }
 
-        CLI::write("Set semester = Fall" . ($dry ? ' [DRY]' : ''), 'light_gray');
-        if ($dry) return true;
+        CLI::write('Semester is derived from fall_semester_start and spring_semester_start; no config row is updated.', 'yellow');
 
-        return (bool) $this->configModel->setConfigValueByKey('semester', 'Fall');
+        return true;
     }
 
     public function run(array $params)