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_replay_dlss_surface_half_store.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+CXX="${CXX:-g++}"
+
+mkdir -p "$ROOT/build"
+"$CXX" -std=c++20 -O2 -Wall -Wextra \
+  "$ROOT/tools/replay_dlss_surface_half_store.cpp" -ldl \
+  -o "$ROOT/build/replay_dlss_surface_half_store"
+printf 'Built %s\n' "$ROOT/build/replay_dlss_surface_half_store"