kernels/rr: staged-image Swin layer engine prototypes

Per-layer staged-image engine for the eleven translated denoiser Swin
layers: descriptors (verified offsets per phase), cut recipes that splice an
isolated native phase into NVIDIA's PTX, wave templates, epilogue notes and
GPU probes. The isolated phase-8 splice produces a byte-identical final
4K frame but is slower than the translated body (14.90 vs 6.59 ms) - a
correctness experiment, not a shipping improvement; docs/rr-engine.md
records the design and the next direct-converter win (B operands built
from transposed accumulators).

kernels/tools/swin_mma.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+"""Dump the mma statements of a swin entry's phase range with their A/B/C/D registers.
+
+Usage: swin_mma.py LAYER LO_STMT [HI_STMT]
+LAYER is a rr_layer_spec alias (enc0, ...).  One line per mma, with the
+statement index, the physical PTX line and the register operands in order.
+"""
+import os
+import re
+import sys
+
+sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "rr"))
+import rr_layer_spec as R  # noqa: E402
+
+
+def main():
+    layer = sys.argv[1] if len(sys.argv) > 1 else "enc0"
+    lo = int(sys.argv[2]) if len(sys.argv) > 2 else 0
+    hi = int(sys.argv[3]) if len(sys.argv) > 3 else 10 ** 9
+    path, entry = R.resolve(layer, None, None)
+    lines = open(path).read().split("\n")
+    first, last = next((a, b) for (nm, a, b) in R.find_entries(lines) if nm == entry)
+    stmts, _ = R.linearise(lines, first, last)
+    for s in stmts:
+        if s.is_mma and lo <= s.idx <= hi:
+            print(f"s{s.idx} L{s.line}: " + " ".join(re.findall(r"%r\d+", s.text)))
+
+
+if __name__ == "__main__":
+    main()