Threads i2v conditioning through the SHARED WanDenoiseLoop with zero T2V risk: init() reads optional
slots i2v_cond (the [mask|cond] latent) + i2v_img_embeds (CLIP) into scratch; _velocity passes them to
the dit (context=, cond=); WanDiT concats cond (16->36ch) and uses the embeds as
encoder_hidden_states_image; capture is disabled only when i2v conditioning is present. For T2V both are
None -> the dit call, CFG, and cudagraph capture are byte-identical (CPU mini 211 pass, 2 skip — no
regression). ToyDiT accepts+ignores cond (image-conditioning is a GPU-path concern). Completes the i2v
backend seam; the program's mask+cond construction + the Wan i2v card/registry + GPU verify follow.
Will Lin
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