The CI toolkit (CUDA 12.9, PTX ISA 8.7) requires:
1. cp.async.bulk needs .mbarrier::complete_tx::bytes completion mechanism
(mandatory since PTX ISA 8.3 / CUDA 12.3)
2. mbarrier.try_wait.parity.acquire needs .cta scope qualifier between
.acquire and .shared::cta
Reverts the DISABLE_TMA workaround — TMA now compiles natively to cubin.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>