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/check_environment.sh

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+section() {
+  printf '\n## %s\n' "$1"
+}
+
+show_if_available() {
+  local tool="$1"
+  shift
+  if command -v "$tool" >/dev/null 2>&1; then
+    "$tool" "$@" 2>&1 || true
+  else
+    printf '%s: not found\n' "$tool"
+  fi
+}
+
+section 'Operating system'
+uname -a
+
+section 'Display adapters and kernel drivers'
+show_if_available lspci -nnk | rg -A4 -i 'vga|3d|display' || true
+
+section 'ROCm / HIP'
+show_if_available rocminfo | head -80 || true
+show_if_available hipcc --version | head -20 || true
+if command -v rocm-smi >/dev/null 2>&1; then
+  rocm-smi --showproductname --showdriverversion 2>&1 | head -50 || true
+elif [[ -x /opt/rocm/bin/rocm-smi ]]; then
+  /opt/rocm/bin/rocm-smi --showproductname --showdriverversion 2>&1 | head -50 || true
+fi
+
+section 'Vulkan'
+if command -v vulkaninfo >/dev/null 2>&1; then
+  vulkaninfo --summary 2>&1 | rg -i 'VULKANINFO|Instance Version|GPU[0-9]|apiVersion|driverVersion|vendorID|deviceID|deviceName|driverID|driverName|driverInfo' || true
+else
+  printf 'vulkaninfo: not found\n'
+fi
+
+section 'Wine / Proton'
+show_if_available wine --version
+show_if_available protontricks --version
+find "$HOME/.local/share/Steam/compatibilitytools.d" -maxdepth 3 -type f -name proton -print 2>/dev/null | head -20 || true
+
+section 'Build and PE inspection tools'
+for tool in x86_64-w64-mingw32-g++ cmake ninja llvm-objdump llvm-readobj objdump strings; do
+  if command -v "$tool" >/dev/null 2>&1; then
+    printf '%-28s %s\n' "$tool" "$(command -v "$tool")"
+  else
+    printf '%-28s %s\n' "$tool" 'not found'
+  fi
+done
+
+section 'Installed relevant Arch packages'
+if command -v pacman >/dev/null 2>&1; then
+  pacman -Q 2>/dev/null | rg -i '(^| )(rocm|hip|vulkan|wine|mingw|clang|mesa)(-| )' || true
+else
+  printf 'pacman: not found\n'
+fi