Skyveil Cloudlands Pass 1 notes

Added active prototype high-altitude cloud island generation.

Generation approach:
- Server-side player tick hook periodically checks loaded chunks near players.
- Deterministic chunk seed keeps generation stable within a session.
- Avoids ChunkEvent.Load because NeoForge documents that direct level interaction during chunk load can be unsafe before the chunk is fully promoted.
- Manual commands are included for testing.

Commands:
/skyveilcloudlands generate_here
/skyveilcloudlands generate_near <count>

Movement:
- Players in the high Cloudlands layer receive refreshed Jump Boost.
- Cloud blocks retain jump-factor and fall-safety behavior from Pass 0.

Limitations:
- This is still a prototype generator, not a full datapack configured-feature worldgen system.
- Build validation was not performed in the sandbox.
