NsTut Endless

Endless 0.10

• Index sparse height-cache results by horizontal chunk and local column. Block changes invalidate only that column's height types instead of scanning the world's cached heights.
• Reuse per-engine block/sky light adapters while preserving delegate changes and inactive-world behavior.
• Check the bounded dense core before the logical sparse range on ordinary terrain reads.
• Add cached-empty-column, neighboring-column, all-height-type, lifecycle and native lighting regressions.
• Add a reproducible dedicated-server benchmark against official vanilla, Fabric without Endless, and the previous Endless revision. Client FPS and populated multiplayer remain separate performance scopes.