- Binding: require compute capability 12.1. Other archs in the same build get
an empty kernel that returned uninitialized output without an error.
- Kernel: a NaN softmax sum now gives a NaN output row (l != 0 instead of
l > 0), as on the ptx_blackwell and Triton routes; rows without keys stay 0.
- Kernel header: the kernel, encode_map and launch get internal linkage, so a
second translation unit can include the header (it failed to link before).
The launch limits move into the header (MaxBatchHeads, MaxRows, MaxTiles),
used by both launch() and the binding and mirrored in Python.
- Header comments: describe the QK/PV overlap that PhaseLead=8 gives; drop
the stale cp.async comment and the unused cp_async_mbar_arrive/prefetch_l2.
- H3 backend: an odd tile count without tile()'s partner tile falls back to
split instead of reaching ptx_blackwell; tile() no longer resolves the
tile-128 route (or warns) under an eager fine-attention override.
- Python module docstring states the replacement contract for the kernel.
SolitaryThinker
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