- add CK_TILE_FMHA_ENABLE_SEQLEN_PADDING option in top-level CMake and propagate
compile definitions and environment export
- wire the flag through fmha example CMake, scripts, and tests so padding
codepaths are only built/executed when enabled
- guard invoke sites (smoke tests, benchmarks, unit harness) and Kargs
initialization with the new macro or runtime env checks to avoid touching
cu_seqlen*/padding fields when disabled
93699b81f5