changelog.d/5166-docs-presence.md

Rama main · réplica de lectura del repositorio original.

- **Docs show who else is on the page and where they type (#5166).** The header lists everyone who has the document open in their colour, and their caret and selected range appear in the text with their name. Presence is kept in server memory only, authorized like a read on every heartbeat, and gone within seconds of leaving or at once when access is removed. CLI: `crewship doc presence <page-slug>`.