Add comprehensive tests documenting current behavior before applying
fixes from main branch. Tests cover:
- Cafe item PointCost parsing (uint32 vs uint16 for different client modes)
- Guild poogie outfit unlock calculation bug (math.Pow issue)
- Guild manage right nil pointer condition (&& vs || logic)
- InfoGuild applicant GR field size for <G10 clients
- Stage binary wait infinite loop risk (no timeout)
- Entrance server hardcoded clan member limit