Constant MD2_NOISE_TEXSIZE_CONSTANTS 

const MD2_NOISE_TEXSIZE_CONSTANTS: &str = r#"
const texsize_noise_lq: vec4<f32>      = vec4<f32>(256.0, 256.0, 0.00390625, 0.00390625);
const texsize_noise_lq_lite: vec4<f32> = vec4<f32>( 32.0,  32.0, 0.03125,    0.03125);
const texsize_noise_mq: vec4<f32>      = vec4<f32>( 64.0,  64.0, 0.015625,   0.015625);
const texsize_noise_hq: vec4<f32>      = vec4<f32>( 32.0,  32.0, 0.03125,    0.03125);
const texsize_noisevol_lq: vec4<f32>   = vec4<f32>( 32.0,  32.0, 0.03125,    0.03125);
const texsize_noisevol_hq: vec4<f32>   = vec4<f32>(  8.0,   8.0, 0.125,      0.125);
"#;

Procedural noise pack texsize_* vec4 constants. Module-scope (was previously emitted inside fs_main) so lifted user functions that reference texsize_noise_lq.zw for a per-texel offset compile cleanly. The values are fixed at engine init (see onedrop-renderer::noise), so promoting them from let to const is a free win.