Per pixelrush-correct.txt the refiner should be a distinct model from
the base generator (paper: SDXL base + SDXL-Turbo ADD-distilled
refiner). New optional node input refiner_model: when provided (and
distinct from the base), execute builds refiner_eps from it via its own
model_sampling, while the schedule functions (alpha_bar_at, sigma_at,
forward/reverse steps) stay bound to the base model. When absent, the
base model is reused for both - the documented intentional choice.
Acceptance test: two recording adapters verify base at t=0 and
refiner at t=K per patch.
WildAi
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