Majestic Terrain

v0.2.0-beta.5 - The Delve goes underground

Changed

• Deepvein Delve is now a cave biome. After the beta.4 in-game review: the quarry floated when it generated near water — a piece projected onto the surface never fully closes against the terrain. The biome is now built on vanilla's own underground band (depth = [0.2, 0.9], exactly what OverworldBiomeBuilder.addUndergroundBiome pins for dripstone and lush caves, because vanilla's surface biomes live at depth points 0.0 and 1.0). So the biome only exists below ground, and the surface of the very same columns is vanilla again.
• The quarry reads as a worked cavern now: one big room with stepped benches, square cut faces with pick marks, rock pillars left standing, rails, spoil heaps and winches, and the pale resonant vein truncated dry at every bench edge. The Vein Workshop is still a complete building — it simply stands inside the cave now, with the biome's Bestiary Leaf on its lectern.
• Fixed depth, no projection. Both structures place at a fixed Y=-25 with no heightmap projection and terrain_adaptation: none (the ancient-city pattern), and every piece is airtight — a full rock shell with air only in the worked spaces, verified by flood fill (0 orphan air cells). There is nothing left to float.
• The gnome only spawns in darkness and underground, by construction: monster category (light 0) and a biome that never shows on the surface. Spawn weight 100 → 120.
• The canyon carver is gone (a canyon in a cave-only biome would cut the surface from above); cave vegetation (dripstone_cluster) replaces the surface patches, and glow_lichen is out — it was a light source, and the gnomes live in the dark.
• The Gnome Warren is no longer a surface mound: it is a chamber complex in the rock, with the same one-block doors and the same unlit rooms.

Notes

• Same dependency versions as 0.2.0-beta.4: Expedition Core 0.0.0-beta.8, Majestic Core 0.0.0-beta.4, Majestic Bestiary 0.0.0-beta.12, Vellumli 1.0.0.
• Install before generating the world, same as always.
• Still untested on foot. The new cave band has not been measured with /majestic_terrain probe yet, and the cavern's look and the fixed Y=-25 placement will be tuned by walking it — /locate structure majestic_terrain:the_delve and dig.