Update brand identity + design system
Partial update of the writable design artifacts in one call. identity shallow-merges the provided fields; emailDesign / imageStyle replace the markdown design-system documents the email agent follows. Provide at least one. Returns the touched fields in the GET /v1/brand shape.
Authorizations
Send your Brew API key as Authorization: Bearer brew_xxx.
Headers
The brand this request acts on. REQUIRED for organization-scoped credentials (otherwise 400 BRAND_ID_REQUIRED — there is no default brand); list ids with GET /v1/brands. Brand-scoped credentials may omit it, and sending a different brand returns 403 BRAND_SCOPE_MISMATCH. A brand outside your organization returns 404 BRAND_NOT_FOUND.
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