Documentation writer batch update task

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 run: Verify manifest screen reference, new "Give a project more slots" how-to, 2026-10-22 heading to v1.2.3599, event catalog re-verified. Quick gate + docs build green; PR #6646 queued to merge lane. Memory: none applied.