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07ba03bcbf
mask_info::decode('b:left,right,sink') always created mask_bottom_right
(IsLocal=false) which ignores the left window boundary. For sliding
window attention (left >= 0), use window_generic (IsLocal=true) so the
kernel respects the left boundary.
Fixes: CK split-KV producing identical results with and without sliding
window. Now 724/724 shapes pass correctness vs Triton.
Made-with: Cursor