0x8: the sky's weight lifts the daylight fade so a low/just-set sun keeps full shafts.
Mask: water writes no depth, so the sea under the horizon read as sky and got a shaft lift
(Westfall sunset: up to 9.7 levels on the water, 0 above the horizon after). The mask pass now
binds the view uniform and keeps depth-0 only where the view ray is above -0.01 elevation.
Adds the leftovers-sea-sunset capture scenario.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
