The blocked collision had three arms (MRT wrapper, channel SRT, level SRT)
and a one-caller MRT wrapper in collision_mrt.cuh. Now block_collide computes
rho/u once and has two compile-time families:
- uniform-equivalent (MRT any level, SRT channel root): collide_dispatch
arithmetic with zero force, no LES: one clamped omega, collide_mrt_no_force
or collide_srt with its zero Guo term (unchanged);
- level SRT (BLOCK_ROOT_BC 0/1): unclamped, collide_srt_no_force, shifted
momentum feq exception kept visible.
No runtime d_params.fx/fy is read. Uniform kernels unchanged (only the
unused inline wrapper is removed from collision_mrt.cuh). Source-text test
updated to the new single call sites.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
