Project SEKAI: Memories Across the SEKAI (Feat: Hatsune Miku)

# Project SEKAI: Memories Across the SEKAI V10.1

## SEKAI Generation Patch

- Fixed the per-block pseudo-random height calculation that created long
  parallel terrain stripes, trenches and disconnected columns.
- Replaced the circular group-world base with a continuous rounded-square
  plateau so every outer district and corner landmark has solid terrain.
- Kept playable areas level at Y=100.
- Added a clean two-block descending rim around the outside of each plateau.
- Increased terrain depth to prevent exposed gaps along the island edge.
- Added fresh `*_sekai_v101` dimensions for School, Stage, Street, Wonderland
  and Empty SEKAI so broken V10 chunks are never reused.

## Save Compatibility

- My SEKAI remains on `sekai:my_sekai_v81`; player builds are preserved.
- Story, Memory Album, choices, cards, teams, Crystals, ranks and quests are
  unchanged.
- Old V10 group dimensions remain stored in the save but are no longer used by
  the Virtual Stage or `/sekai travel` commands.

## Compatibility

- Minecraft 1.21.1
- Forge 52.1.0
- NeoForge 21.1.172
- Java 21