Crazy Antarchy: Frosted Prison Guard

Adds a placement check for Crazy Antarchy's Ruined Foundry (crazyantarchy:ruined_foundry). Generation is rejected when terrain water intersects the structure's footprint. The check uses terrain generation data without loading neighboring chunks.

Preserves the existing Frosted Prison placement restrictions and the foundry's chosen rotation and variant. Existing structures and generated chunks are not modified. The Ruined Foundry templates and generation datapack are supplied separately by Crazy Antarchy; this mod does not bundle them.

Validation: compiled for Java 21 / Minecraft 1.21.1 / NeoForge 21.1.253; three wet sites rejected and three dry footprints accepted in a dedicated-server test. A fresh-world locate search found a valid foundry in approximately eight seconds.

Install on the server, or the client for single-player. Cataclysm remains a required dependency.