Tectonic - Au Naturel Edit

Very minor superficial changes:

Fixed

• Invert density function - Added protection against division by zero that could produce Infinity/NaN values and corrupt terrain generation
• Height validation messages - Corrected error messages that incorrectly described validation requirements (e.g., "should be greater than 0" now correctly reads "must be 0 or negative")

Changed

• Noise seed calculation - Seeds are now derived from registry location instead of object memory address, ensuring identical terrain generation across game sessions with the same world seed
• Snow offset caching - Replaced volatile field with AtomicInteger using compare-and-set for improved thread safety and performance under concurrent chunk generation