gShadowRaw deferred binding is dead: CONFIRMED, with a correction to the known lead #148

assets/shaders/lighting_pass.frag:20 (set 0, binding 5); descriptor written at
src/Graphics/Vulkan/VulkanDeferred.cpp:789-799

gShadowRaw is declared at lighting_pass.frag:20 and never sampled: the file's only shadow fetch is
:99, texture(gShadow, ...). The descriptor is nonetheless written every frame at VulkanDeferred.cpp:789-799.

Correction to the lead (and to CLAUDE.md §7 item 2): the lead says "the gShadowRaw binding plus its
sampler and descriptor writes are dead". The sampler is NOT dead and must not be deleted.
m_shadowRawSampler (VulkanShadow.cpp:92-102) also feeds set 3, binding 1
(VulkanShadow.cpp:236-264, re-written on resize at VulkanRenderer.cpp:1643-1665), and that binding is
sampled by the forward shaders: default_shader.frag:42 and :66, skinned_shader.frag:37 and :76.

Only the deferred set-0/binding-5 half (the declaration at lighting_pass.frag:20 and the write at
VulkanDeferred.cpp:789-799) is removable. Deleting the sampler would break forward-path shadows.

Severity: minor (dead descriptor write per frame).

Found by a full audit of the graphics layer. Assessed severity: minor: dead code.