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.

tests/test_motion_geometry.py

@@ -0,0 +1,45 @@
+"""Motion-grid selection and padded low-resolution allocation regression."""
+from pathlib import Path
+import subprocess
+import tempfile
+import unittest
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+class MotionGeometryTests(unittest.TestCase):
+    def test_low_res_padding_flags_and_display_res_mapping(self):
+        source = r'''
+#include "d4r_motion_dilation.h"
+#include <cassert>
+int main() {
+    D4rMotionDilationParams p = {};
+    p.render_width = 854; p.render_height = 480;
+    p.motion_width = 856; p.motion_height = 480;
+    p.motion_pitch = 4096; p.jitter_x = 0.375f; p.jitter_y = -0.25f;
+    auto low = p;
+    assert(d4r_motion_dilation_geometry(&low, 0xb, 2560, 1440));
+    assert(low.motion_width == 854 && low.motion_height == 480);
+    assert(low.motion_pitch == 4096 && low.jitter_x == 0 && low.jitter_y == 0);
+    low = p;
+    assert(d4r_motion_dilation_geometry(&low, 0x4b, 2560, 1440));
+    low = p; low.motion_width = 853;
+    assert(!d4r_motion_dilation_geometry(&low, 0xb, 2560, 1440));
+    low = p; low.motion_height = 479;
+    assert(!d4r_motion_dilation_geometry(&low, 0xb, 2560, 1440));
+    low = p;
+    assert(!d4r_motion_dilation_geometry(&low, 0xf, 2560, 1440));
+    assert(!d4r_motion_dilation_geometry(&p, 0x49, 2560, 1440));
+    p.motion_width = 2560; p.motion_height = 1440;
+    assert(d4r_motion_dilation_geometry(&p, 0x49, 2560, 1440));
+    assert(p.jitter_x == 0.375f && p.jitter_y == -0.25f);
+    p.render_width = 0;
+    assert(!d4r_motion_dilation_geometry(&p, 0x49, 2560, 1440));
+}
+'''
+        with tempfile.TemporaryDirectory() as tmp:
+            runner = Path(tmp) / "geometry"
+            subprocess.run(["c++", "-x", "c++", "-std=c++17", "-Wall", "-Wextra", "-Werror",
+                            "-I", str(ROOT / "tools"), "-o", str(runner), "-"],
+                           input=source, text=True, check=True, capture_output=True)
+            subprocess.run([str(runner)], check=True, timeout=5)