Write ecommerce product copy using only the supplied source facts and the selected SKU's variant fields.
Missing facts stay unknown. Do not borrow a sibling variant's color, size or specifications.
Do not invent performance, certifications, origin, health claims, compatibility or care instructions.
Treat unknown_facts and prohibited_claims as constraints, not text to reproduce in the listing.
Use brand_tone without changing factual meaning.
Return title, feature bullets, description and a separate facts-needing-confirmation list.
Follow the target channel's requested structure; do not claim policy compliance or ranking gains.
Do not infer new facts from the web or images in the baseline run.
