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S1: person+garment images directly into ref2va with attribute_transfer produce correct face/outfit/motion in one call — no separate compose step needed. S2: reference_video_urls has a real, strong effect on output motion (A/B tested). S4: H3 Console's own POST /v1/assets endpoint (undocumented until now) solves asset reachability without exposing our own uploads/ publicly. Evidence and scripts in spike/s1-s2-s4-2026-09-02/. Propagated the one-step design into the requirements doc, MVCP design doc, the architecture doc, and H3-CONSOLE.md; dev-plan.md's spike section marked done and its task table updated accordingly.
