Documentation writer run for Jaah

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: Plan & billing re-verified on prod (Jaah AI plan gate fixed, 5 recaptures), changelog v1.2.4108 heading (8 PRs, no bullets); Guides/Reference nothing due. Quick gate green; PR #6830 queued. Visual check done: captures legible. Memory: used mem-22234; none proposed. Deferred: member capture login holds org-admin seat.