BetterEnd

Fixes

• LakePiece/MountainPiece height caches were not thread safe under parallel worldgen (BetterEnd#594)
• Server would not start on a world with a vanilla End
• Assemble swords and spears from the right smithing template

Validation

• ✅ BiomesOPlenty + Terralith (BiomesOPlenty-fabric-26.2-26.2.0.0.26.jar, Terralith_26.2_v2.6.4.jar, GlitchCore-fabric-26.2-26.2.0.0.0.jar, TerraBlender-fabric-26.2-26.2.0.0.2.jar, lithostitched-1.7.13-fabric-26.2.jar, tested: gametest+worldgen)
• ✅ Incendium alone (Incendium_Legacy_26.2_v5.5.0.jar, tested: gametest+worldgen)
• ✅ Nullscape alone (Nullscape_26.2_v1.2.20.jar, tested: gametest+worldgen)
• ✅ BOP + Terralith + Incendium + Nullscape (BiomesOPlenty-fabric-26.2-26.2.0.0.26.jar, Terralith_26.2_v2.6.4.jar, GlitchCore-fabric-26.2-26.2.0.0.0.jar, TerraBlender-fabric-26.2-26.2.0.0.2.jar, lithostitched-1.7.13-fabric-26.2.jar, Incendium_Legacy_26.2_v5.5.0.jar, Nullscape_26.2_v1.2.20.jar, tested: gametest+worldgen)