ABL successor: time-varying inflow from precursor planes

[ia267]

Read precursor inflow planes from file and impose them as a time-varying inflow BC, advancing through the library as the simulation proceeds (Incompact3d, iin==3, inflow/outflow, Case-ABL.f90:169-276)

Use existing Dirichlet face BC

• case_cylinder_t already imposes a Dirichlet inflow on a domain via field_set_face(u, bc_start_u, out_vel, X_FACE, bc_start=BC_DIRICHLET, ...) (src/case/cylinder.f90).
• This issue generalises it to a per-face plane that varies in time (an extension of the existing BC)

Scope

• Generalise the Dirichlet-inflow path so that the inflow face value is a full y-z array (one value per face node) on both OMP and CUDA backends
• Read stored inflow planes from file (ADIOS2) and advance them in time, cyclic replay when the library is exhausted (Incompact3d index ux_inflow(mod(itime, ntimesteps), j, k)).
• Connect it to case boundary_conditions/pre_correction

Acceptance criteria

• Dirichlet inflow accepts a per-face array on both backends (unit test: imposed plane appears exactly at the inflow face)
• Successor reads and applies planes, interpolating/cycling in time
• Round-trip precursor --> successor reproduces the precursor inflow turbulence
• Divegence-free/stable convective outflow over a successor run