Reuses everything: 2 WanTransformer3DModel experts + BoundaryTimestepRouting (from the A14B MoE pattern),
the CLIP image encoder + first-frame [mask|cond] conditioning + the i2v program (from the Fun-InP i2v
port), and the shared WanDenoiseLoop (i2v hooks + the boundary expert). No new adapter. CPU-verified: the
toy MoE i2v runs end-to-end (2 experts + boundary + conditioning -> finite video); resolves with i2v caps.
Structural (GPU-pending: 2x14B, like the A14B T2V). Wan family now largely covered (T2V 1.3B/14B/TI2V-5B/
A14B, causal SF, i2v 1.3B/14B/A14B). CPU mini 211/2.