Integrate Marketing Form Handlers

1. Reads the existing form handler and the flow it feeds, then maps form fields to Lead fields. Existing fields are remapped and new ones added as needed.
2. Updates the flow's create-lead and update-existing-lead elements to carry the new fields.
3. Activates the new flow version and confirms that the linked form handler is published, so the pipeline goes live.
4. When asked for a new form, builds a native lead capture form in the marketing CMS folder with Lead fields, customizes the thank-you message and saves it. The form-triggered flow is generated automatically and left in draft for activation.
5. For larger setups, deploys supporting pieces alongside the form handler: a custom field, a permission set, the CMS form and an event-triggered flow.

Forms often end up embedded in a page. The next capability for that is Build Marketing Landing Pages.