Integrate BLAS/TLAS acceleration structures and RT shadow compute pass
into the deferred rendering demo. Adds GpuContext::new_with_features()
for requesting EXPERIMENTAL_RAY_QUERY, Mesh::new_with_usage() for
BLAS_INPUT buffer flags, and extends the lighting shadow bind group
to 9 entries (shadow map + IBL + SSGI + RT shadow).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Demonstrates two-pass deferred rendering: G-Buffer pass writes position,
normal, albedo, and material to 4 render targets; lighting pass composites
with 8 animated orbiting point lights plus a directional light using a
fullscreen triangle.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
