- diffusion_attention: clear the HunyuanVideo-1.5 null-mask flag with an always_call
post-hook so it is scoped to one hooked forward and never latches across an
exception; add attention_backend_supported_on_device to arch-gate an
already-resolved backend on a specific (heterogeneous) CUDA device.
- video: make the explicit MagCache resize transactional via _step_cache_all_or_none
(refuse to stack a fresh cache over one that could not be disabled; roll a mixed
resize back and report the true state); raise on a failed all-or-none rollback
instead of falsely reporting an uncached pipeline.
- diffusion_cfg_parallel: re-validate the attention backend on the replica device
and pin native there when unsupported; mirror the primary's max tier on the
replica (max-autotune compile + direct QKV fusion) via a new speed_mode arg;
prefer a viable heterogeneous secondary GPU over an unusable identical one; clear
the const cache at each plan_generation.
- diffusion_vae_quant / diffusion_precision: detect a partial diffusers
layerwise-fp8 mutation (leftover casting hooks the torchao detector cannot see)
and fail the load closed, while a clean failure still falls back to dense.
- video_speedmem_bench: engage the dual-expert cache all-or-none like the loader.
- frontend video api: add text_encoder_quant / vae_quant and the auto/off literals
to VideoLoadRequest so typed callers match the backend contract.
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