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- 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).
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