- Load HVAC_Zoho_Scheduled_Sync on ALL requests (not just admin)
so WP-Cron can find custom schedules and action hooks
- Add add_option hook for first-time setting creation
- Explicitly call schedule_sync() in save_settings() to ensure
scheduling works even when option value hasn't changed
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>