Port of the upstream vLLM change #58863 (Apache-2.0). With --use-replayssm and speculative decoding, Gated DeltaNet layers verify the
draft window from a read-only checkpoint and keep a per-token replay record; after sampling one commit replays
the accepted tokens and writes the recurrent state once. The PLE short conv gets the same treatment.
Co-Authored-By: Hinata <hinata@idihore.id>
Signed-off-by: MOVZX <movzx@yahoo.com>