One armed speculative verify round on an SSMCache: the pre-round state snapshot (retained refs — MLX arrays are immutable, so this is free) plus the window's recorded rows. recurDecode/recurWindow record them.
recurDecode
recurWindow
True from specRoundBegin() until the layer's forward records.
The window's recorded rows; null until the verify forward records.
Window length S of the recorded verify forward.
One armed speculative verify round on an SSMCache: the pre-round state snapshot (retained refs — MLX arrays are immutable, so this is free) plus the window's recorded rows.
recurDecode/recurWindowrecord them.