Document writer run with multiple sections

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: Machines + Networks (/nodes) re-verified on prod, 10 shots retaken, failed-add row menu documented; Guides/Changelog/Reference not due. Quick gate green; PR #8017 queued to the merge lane. Visual check done: captures legible, names blurred. Memory: used mem-22234.