rr: add FSR Ray Regeneration, exact RDNA3 inference and motion experiments

Add an experimental FSR Ray Regeneration backend for D3D12 RR requests:
- Convert depth, motion, normals and albedos into AMD denoiser inputs.
- Split and recompose diffuse/specular signals, then run Super Sampling.
- Add stability/detail controls, demodulation guards and halo limiting.
- Handle AMD provider discovery under NVIDIA GPU spoofing.
- Add runtime probes, synthetic reference scenes and per-dispatch profiling.

Add exact gfx11 DLSS-RR inference using f16 cooperative matrices:
- Reproduce FP8 conversions, accumulation and camera reprojection arithmetic.
- Widen model weights and avoid requiring VK_EXT_shader_float8.
- Extend model building, replay tools and descriptor metadata.

Expand motion preprocessing and experimental AW2 native-motion support:
- Add tiled LDS dilation, padded allocation handling and thin-only sky fill.
- Order dilation with input waits and NGX on the selected stream.
- Add jitter-aligned native composition, hybrid routing and wire history repair.
- Add prepared masks, sparse repair and independent motion/repair controls.

Add optional fused R11G11B10 input/output conversion, sampled stage timings
and profile summarization. Extend configuration, packaging, documentation,
FidelityFX headers and CPU/GPU regression coverage.

NOTICE

@@ -17,6 +17,15 @@ patches/vkd3d-proton/*.patch
     under the GNU Lesser General Public License, version 2.1. These patches are offered under the
     same license.
 
+third_party/fidelityfx/
+    AMD FidelityFX SDK 2.3.0 API headers (ffx_api.h, ffx_api_types.h, ffx_denoiser.h), copied
+    unmodified; the SDK license lists them under the MIT license (third_party/fidelityfx/LICENSE.txt).
+    AMD's runtime DLLs are not included and remain under AMD's binary terms.
+
+kernels/support/fsr_rr_prepare.comp
+    Its diffuse/specular split follows the DLSS-RR to FSR-RR adapter in Zach Hembree's OptiScaler
+    branch ffx-denoise-experimental and burak113's continuation (GPL-3.0).
+
 Release zips (scripts/package_release.sh) also bundle binaries of ZLUDA (Apache-2.0 or MIT, with
 LLVM under Apache-2.0 with LLVM exceptions), the patched vkd3d-proton (LGPL-2.1) and OptiScaler
 (https://github.com/optiscaler/OptiScaler, GPL-3.0, unmodified). Each zip carries their license