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/gen_enc0_m.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+"""Generate engine/rr/enc0_m.comp's source: encoder 0 with ptx2rr.py's translation of NVIDIA's per-pixel feature gather
+(run by wave 0, as NVIDIA runs it in one warp) and the native rest (engine/rr/enc0_m_decl.glsl, enc0_m_tail.glsl).
+
+usage: gen_enc0_m.py ENC0.generated.comp OUT.comp
+
+The translation's main is cut at its first workgroup barrier: by then the 10 x 10 pixels' features and the noise grid
+are in its shared buffer sh and the state surfaces 304 / 1016 are written. Model data derived from the user's DLL is in
+the translated part; do not commit the output.
+"""
+import re
+import sys
+
+
+def main():
+    src, out = sys.argv[1:3]
+    lines = open(src).read().split('\n')
+    m = next(i for i, l in enumerate(lines) if l.startswith('void main()'))
+    head = '\n'.join(lines[:m]).replace('layout(local_size_x = 32, local_size_y = 1, local_size_z = 1) in;',
+                                         'layout(local_size_x = 128, local_size_y = 1, local_size_z = 1) in;')
+    body = lines[m + 2:]
+    first = next(i for i, l in enumerate(body) if not re.match(r'    (precise |bool |uint64_t |float |uint |int )', l))
+    bar = next(i for i, l in enumerate(body) if l.strip() == 'memoryBarrierShared(); barrier();')
+    decls, prologue = body[:first], body[first:bar]
+    # NVIDIA's warp gathers the 96 key pixels in a loop of three 32-pixel steps, then the four corners: the steps go to
+    # waves 0-2 (the setup before the loop runs in every wave, the corners in wave 0)
+    do_ = next(i for i, l in enumerate(prologue) if l.strip() == 'do')
+    end = next(i for i, l in enumerate(prologue) if l.strip().startswith('} while (again_'))
+    loop = '\n'.join(prologue[do_ - 1:end + 1])
+    inc = re.search(r'(r\d+) = uint\((r\d+) \+ 32u\);\n\s+(p\d+) = \(\1 < 96u\);', loop)
+    counter = inc.group(1)
+    loop = loop.replace(inc.group(0), inc.group(0).replace('+ 32u', '+ 96u'))
+    pre = [l.replace(f'{counter} = uint(0u);', f'{counter} = uint(32u * gl_SubgroupID);') for l in prologue[:do_ - 1]]
+    post = prologue[end + 1:]
+    head = head.replace('shared uint mms[384];', 'shared uint mms[384 * 4];')
+    text = (head + '\n#extension GL_GOOGLE_include_directive : require\n#include "enc0_m_decl.glsl"\n\nvoid main()\n{\n' +
+            '\n'.join(decls) + '\n    // the translated feature gather (NVIDIA\'s one warp, its pixel loop split over the waves)\n' +
+            '\n'.join(pre) + '\n    if (gl_SubgroupID < 3u) {\n' + loop + '\n    }\n    if (gl_SubgroupID == 0u) {\n' +
+            '\n'.join(post) + '\n    }\n#include "enc0_m_tail.glsl"\n}\n')
+    open(out, 'w').write(text)
+    print(f'{out}: {len(decls)} declaration lines, {len(prologue)} prologue lines')
+
+
+if __name__ == '__main__':
+    main()