Major changes to sync strategy following MLS Grid best practices:
- Initial sync now fetches only Active/Pending properties (~30K vs 1.3M)
- Replication (incremental) fetches all changes, deletes non-Active/Pending
- On-demand media fetching replaces background queue (avoids rate limits)
- Media downloaded and cached when first viewed, not during sync
- Updated CLI commands: wp mls media status/fetch/clear
- Comprehensive documentation with troubleshooting guide
This fixes the "Value out of range" API error caused by high $skip values.
Co-Authored-By: Claude <noreply@anthropic.com>
