Lead magnet landing page and ad copy

This is the third step of the lead magnet system. You start it from an Airtable button on a lead magnet record once the guide is written.

It sets ai_status to AI Writing and pulls in your brand context, audience avatar and niche through the brand link. An OpenAI model writes landing page copy for the lead magnet, which is saved as a Website Copy output. A second prompt writes several ads, and a Code step splits them so each ad is saved as its own output record with its title. When both are done, ai_status changes to AI Complete, or to AI Error if something fails.