Jaah Docs Writer Multi-Item Run

Docs-writer run. Follow apps/docs/WRITER.md on develop. Do each item that is due, all in ONE PR: 1. Screens: one console feature's reference page. 2. Guides: one Get started, Using Jaah or FAQ item. 3. Changelog: the next batch of prod promotions 4. Reference: the Jaah API and Real-time reference against the code. Sign in only through the capture helper. Nothing due: end with no PR.

Docs-writer: Persona details re-verified on prod (4 captures, complete-from labels); Jaah API console_session param described. Guides/Changelog not due. Full gate green; PR #6228 merged, Jaah Deploy success. Follow-up draft #7912.