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Add a regression test covering 1D single-dimension tensor TMA copy (global -> shared -> global) with warp specialization disabled. The underlying bug was fixed in #1840, but the test suite only covered 2D descriptor-based TMA paths. This test ensures the 1D bulk copy path (cp.async.bulk) also works correctly with proper mbarrier allocation. Closes #1842 Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>