srdatalog.ir.codegen.cuda.render.iir_cf

CUDA renderers for the iir.cf (control-flow) dialect.

Per docs/stage3a_execution_plan.md §7 task S3A.3 — handlers split out from the legacy codegen/cuda/emit.py 41-case match. Every handler is a verbatim port of one match arm (pure refactor; no semantic change). Byte-equivalence preserved.

22 statement handlers + 2 expression handlers (RawString and VarRef appear in both modes; iir.cf owns both forms here).