First e2e launch crashed every CP rank at the symm token fill:
index_copy_cuda is not implemented for Float8_e4m3fn — the production
KV pool dtype, which the 8-rank test missed by building its pools as
uint8. The fill is a whole-token-row copy, so it is dtype-agnostic:
both the staging span and the current rows now go through uint8 views.
The 8-rank test now builds the KV pools and current rows as
float8_e4m3fn (payloads constructed as bytes, compared as bytes) so
the production dtype is what every phase exercises.
Validated on g0033: all four 8-rank byte-exactness phases under fp8.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
leavelet
d66758d929