For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
One event fires on the contact resource today. Additional events (contact.updated, contact.deleted) are typed and tracked internally — subscribe to contact.created for now and watch the Changelog for new types.