Jaah Documentation Writer Batch 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: Sign in re-verified on prod, v1.2.849 changelog bullet, 3 NodeLink org_id API param descriptions; Guides not due. PR #5685 merged, deploy green. Full gate red only on 4 develop-wide web tests (draft #6869); draft #6817 filed.