v2 - 2026-09-21 - Tables, checklists and code languages in rich text

Richtext Rich text fields now accept tables, checklists, and a code block naming its language. Descriptions are served from the live editor document, so these are also what a read returns.
Richtext Mentions, emoji, embeds and collapsible sections are returned as urn:pb:node: placeholder links. Sending a link back unchanged restores the content it stands for; deleting the link deletes that content.