fog_hook.wgsl: radial exponential fog fitted to the zone's 1.12 start/end
(60 % survival mid-span, closed over the last stretch so the zone end
holds), optional height fog, end-fog colour shift, sun-fog lobe; interior
WMO spans stay classic; the WDL hull pair takes the far colour.
lighting/fog_model.rs fills the MonkeyFrame fog rows each frame (derived
from the 1.12 bands, or LightFogBand.dbc rows); fog_d.x carries the scene
fog end as the Modern flag, fog_d.zw the octahedral sun direction.
resolve.rs: Modern stretches the fog end with farclip past 777 only.
sky.wgsl/sky.rs: the dome's low band eases into the same far colour.
Classic packs zeros and every new path branches out.
Includes the cherry-picked p0 fix 05d6b1ad (MonkeyFrame rows fog_a..).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
