tools/cuda-ab: isolation probes from the transformer/streams_events forensics

- tgemm_probe: minimal X[64x256]xW[256x256] GEMM isolation. Found the
  deterministic first-page corruption: after a forwarded launch (and
  sometimes already after the H2D upload) the FIRST 8 bytes of the first
  data-window page are replaced by that page's bytes at offset 8
  (X[0..1] <- X[2..3]; vidmem dump confirms; OUT-UNCH shows chunk==guest),
  which corrupts GEMM row 0 for all 256 columns (bad=256/pass, identical
  across 3 passes). Not rel_mod-dependent (A/B at runtime).
- streams_events_probe: per-buffer DPTRS + per-buffer bad + first-8
  expected/actual for the 3-stream event chain (green on a clean boot,
  bad=131072 after several clients - the client-switch resolution class).
- memset2d_probe: per-phase bad/PHIST for victory_memset2d (verified the
  r458 LINE_COUNT fix: bad_total=0, all three phases).

0 files changed, 0 insertions, 0 deletions