feat: add d4r inference engines and Windows parity tooling

Add native K/M/RR inference engines, HIP kernels, replay and validation
harnesses, and Windows DLSS setup and runtime support. Include GPU
profiling tools, build and packaging scripts, platform integration
patches, and implementation documentation.

scripts/build_vkd3d_proton_d4r.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Builds vkd3d-proton with patches/vkd3d-proton/ applied (split command lists
+# for the shim's same-frame DLSS, D4R_SHIM_SPLIT_FRAME) into OUT_DIR, which
+# the game launcher takes as D4R_VKD3D_DIR.
+# usage: build_vkd3d_proton_d4r.sh OUT_DIR
+# Env: VKD3D_PROTON_SRC (clone, default ~/.cache/d4r-vkd3d-proton),
+#      VKD3D_PROTON_COMMIT (default 3dfc6f07, the base GE-Proton11-3 ships).
+if [[ $# -ne 1 ]]; then
+  printf 'usage: %s OUT_DIR\n' "$0" >&2
+  exit 2
+fi
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+OUT="$(realpath -m "$1")"
+SRC="${VKD3D_PROTON_SRC:-$HOME/.cache/d4r-vkd3d-proton}"
+COMMIT="${VKD3D_PROTON_COMMIT:-3dfc6f07}"
+BUILD="$SRC-build"
+
+[[ -d "$SRC/.git" ]] || git clone https://github.com/HansKristian-Work/vkd3d-proton.git "$SRC"
+# -f: the clone is a build cache; the patch is reapplied below.
+git -C "$SRC" checkout -q -f -B d4r-split "$COMMIT"
+git -C "$SRC" submodule update --init --recursive -q
+git -C "$SRC" apply "$ROOT"/patches/vkd3d-proton/*.patch
+[[ -d "$BUILD" ]] || meson setup --cross-file "$SRC/build-win64.txt" --buildtype release -Denable_tests=false "$BUILD" "$SRC"
+ninja -C "$BUILD"
+mkdir -p "$OUT"
+x86_64-w64-mingw32-strip -o "$OUT/d3d12.dll" "$BUILD/libs/d3d12/d3d12.dll"
+x86_64-w64-mingw32-strip -o "$OUT/d3d12core.dll" "$BUILD/libs/d3d12core/d3d12core.dll"
+printf 'Built %s/d3d12.dll and d3d12core.dll\n' "$OUT"