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.

engine/rr/rr2_pack.py

@@ -0,0 +1,90 @@
+#!/usr/bin/env python3
+"""Pack a preset F stage's weights, read from the user's nvngx_dlssd.dll (engine/rr/rr2_ref.dll_weights), for
+engine/rr/rr2_m.comp.
+
+usage: rr2_pack.py STAGE NVNGX_DLSSD_DLL OUT.bin OUT.h
+
+swin_pack.py's layout: transposed products as 16 x 16 tiles, every tensor's outputs in slot order (slot j holds the
+natural index inter(j)); a merge's or the expand's inputs are sub-positions of C channels each. OUT.h also defines
+the stage's shape for the shader (KIND, C, NH, NB, CM, CL, GUIDE).
+"""
+import os
+import sys
+
+import numpy as np
+
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+from enc1_ref import inter  # noqa: E402
+from enc1_pack import a_tiles, b_tiles, cubic_table, act_table  # noqa: E402
+from rr2_ref import STAGES, EXPAND, dll_weights  # noqa: E402
+
+
+def main():
+    stage, dll, out_bin, out_h = sys.argv[1:5]
+    w = dll_weights(open(dll, 'rb').read(), stage)
+    if stage in EXPAND:
+        C, CL, NH, NB = EXPAND[stage]
+        kind, CM, guide = 2, 0, 0
+    else:
+        C, c_up, CM, NH, NB = STAGES[stage]
+        kind, CL = (4 if stage == 'enc0' else 5 if stage == 'dec0_1' else 3 if stage.startswith('dec') else 1 if c_up else 0), 0
+        guide = 0 if kind >= 3 else 1
+    I32, I64, IC = inter(32), inter(64), inter(C)
+    e = {}
+    if kind == 1:
+        e['w1'], e['b1'] = ('A', w['w1'][:, IC]), ('H', w['b1'][IC])
+    if kind == 4:   # encoder 0's embedding branches
+        for b in range(2):
+            e[f'ewd{b}'] = ('A', w['ewd'][b][:, I32])
+            e[f'ebd{b}'] = ('H', w['ebd'][b][I32])
+            e[f'ewu{b}'] = ('A', w['ewu'][b][:, IC])
+        e['ebu'] = ('H', w['ebu'][IC])
+    if kind == 2:
+        I4C = [C * (j // C) + IC[j % C] for j in range(4 * C)]
+        e['we'], e['be'] = ('A', w['we'][:, I4C]), ('H', w['be'][I4C])
+    for h in range(NH):
+        e[f'wqk{h}'] = ('A', w['wqk'][h][:, I32])
+        e[f'wv{h}'] = ('B', w['wv'][h][:, I32])
+        e[f'wo{h}'] = ('A', w['wo'][h][:, IC])
+        e[f'bias{h}'] = ('H', w['bias'][h][np.ix_(I64, I64)])   # [key slot][query slot]; symmetric
+    e['bo'] = ('H', w['bo'][IC])
+    for b in range(NB):
+        e[f'wd{b}'] = ('A', w['wd'][b][:, I32])
+        e[f'bd{b}'] = ('H', w['bd'][b][I32])
+        e[f'wu{b}'] = ('A', w['wu'][b][:, IC])
+    e['bu'] = ('H', w['bu'][IC])
+    if CM:
+        e['wm'], e['bm'] = ('A', w['wm'][:, inter(CM)]), ('H', w['bm'][inter(CM)])
+    if 'wh' in w:
+        e['wh'], e['bh'] = ('A', w['wh']), ('H', w['bh'])
+    if kind == 5:   # dec0's output tail: tanh of every binary16 value, correctly rounded, by its bits
+        with np.errstate(all='ignore'):
+            x = np.arange(65536, dtype=np.uint32).astype(np.uint16).view(np.float16).astype(np.float64)
+            e['tanh'] = ('U', np.tanh(x).astype(np.float16).view(np.uint16))
+    e['cubic'] = ('U', cubic_table())
+    e['act'] = ('Y', act_table())
+    blob, defines = bytearray(), []
+    for name, (kd, a) in e.items():
+        while len(blob) % 256:
+            blob.append(0)
+        off = len(blob)
+        if kd == 'A':
+            blob += a_tiles(a).tobytes()
+        elif kd == 'B':
+            blob += b_tiles(a).tobytes()
+        elif kd == 'Y':
+            blob += np.ascontiguousarray(a, np.uint8).tobytes()
+        elif kd == 'U':
+            blob += np.ascontiguousarray(a, np.uint16).tobytes()
+        else:
+            blob += np.ascontiguousarray(a, np.float16).tobytes()
+        defines.append(f'#define W_{name.upper()} {off}u   // {kd} {a.shape}')
+    shape = [f'#define KIND {kind}', f'#define C {C}', f'#define NH {NH}', f'#define NB {NB}', f'#define CM {CM}',
+             f'#define CL {CL}', f'#define GUIDE {guide}']
+    open(out_bin, 'wb').write(bytes(blob))
+    open(out_h, 'w').write(f'// generated by engine/rr/rr2_pack.py for {stage}\n' + '\n'.join(shape + defines) + '\n')
+    print(f'{stage}: {len(blob)} bytes, {len(e)} entries')
+
+
+if __name__ == '__main__':
+    main()