Email Creative Builder Writes and iterates a single email creative — subject-line variants + preheader, body copy, one clear CTA, and a plain-text alternate — each message-matched to the destination landing page and traced to approved claim wording. This is the build skill that produces the SEND E/D unit (the email analog of paid's ad-creative-builder). It does not score the email, run the D1 veto, or compute the EQS — that is — and it does not design the multi-step flow ( ) or the test ( ). Scope guard : this skill builds the creative unit + message-match + claim flags only. It drafts subjec…