engine/rr: native preset F (DLSS 4.5 Ray Reconstruction) and the reference's fused roundings

- engine/compile_rr2.py, runtime_rr2.inc, engine/rr/rr2_m.comp, exposure_f.comp,
  gen_rr2_enc0.py, rr2_pack.py, rr2_ref.py: the rr2_* model (nvngx_dlssd.dll 310.9's
  third network) as d4r's own shaders - exposure, enc0 gather/block split, enc1-5 and
  dec4-0 through one matrix shader, translated output passes; weights packed from the
  DLL, argument blocks from the capture
- ptx2rr: match the driver's fused roundings - opaque-zero OR around cvt.rn.f16.f32
  against v_fma_mix, half-away-from-zero formatted stores, UNORM 10:10:10:2 as RGBA32F
  of q/1023, OCML tanhF with the AMDGPU exp lowering, binary16 fma and fetch roundings;
  --probe for register bisection against ZLUDA
- dec0_m/swin_m/enc0_*: RR_MIX build option (D4R_RR_MIX=1), one v_fma_mix rounding per
  32-deep step, ~5% faster, not bit-exact; default build stays exact
- runtime_rr.inc: RModel/REngine dispatch to the D4RR0002 model; replay_rr: RGBA32F and
  A2B10G10R1010 texel sizes, roughnessPacked bit, larger debug staging
- shim: engine\rr-f model slot, 310.9 version probe so preset F is only claimed when the
  CUDA path has it; d4r.ini / d4r_config.py Model = F; run_rr_engine_compare.sh D4R_RR_DLL
- kernels/rr/swin_native.h + rr_swin_native_test.cpp: HIP port of encoder 1 for the
  FP8-product and rounding cost measurements
- engine/rr/README: preset F's block, options, capture-by-capture results, timings and
  the open camera-matrix difference

packaging/d4r.ini

@@ -27,8 +27,10 @@ ShowWatermark = false
 ; auto uses the denoiser when available; false disables the route.
 ; RR D/E temporal validation on gfx1201 uses [Kernels] NativeFp8 = on; scalar FP8 RR is not validated.
 Enable = auto
-; Independent denoiser presets: auto (game choice), default, D or E (transformer).
-; E requires a denoiser DLL containing that model.
+; Independent denoiser presets: auto (game choice), default, D, E (transformer) or F (DLSS 4.5).
+; E and F through NVIDIA's library need a denoiser DLL containing that model (F: 310.9 or later). On the engine
+; ([Engine] Enabled = true) F runs from the model in d4r\engine\rr-f; frames the library serves instead show
+; preset D when the DLL is older (d4r_nvngx.log says so).
 Model = auto
 
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