docs: document Hermes Relay and the desktop feature wave
- New page user-guide/messaging/relay.md: what Relay is, enrollment
(hermes gateway enroll), capability handshake (media, native
approval/clarify, threads, typing), config keys, troubleshooting —
derived from gateway/relay/ + gateway_enroll.py (PRs #48147 #48242
#71300 #71363 #71404 #71624 #69721).
- desktop.md: artifacts viewer, timeline rail, find-in-page,
multi-window, git review/worktrees, multi-terminal + persistence,
theme import, rebindable shortcuts, quick entry, context-usage
popover, keep-awake, command palette, Hermes Cloud mode, memory
graph — all verified against apps/desktop/ source.
Teknium
068d7812a4