- Zone manifest (zone.json): generated on export with map name, map ID,
tile list, biome, creature flag, and file paths. This is what the
wowee client will read to discover and load custom zones.
- Export workflow now produces a complete loadable zone package:
zone.json + MapName.wdt + MapName_X_Y.adt + creatures.json
- ZoneManifest class with save/load (JSON format)
- Custom map IDs start at 9000+ to avoid conflicting with retail maps
- New Terrain dialog shows helper text for map name format
