Add Hermes as a desktop app and a coding agent

Hermes joins Install > AI as a desktop app, sits beside it under Remove > AI,
and becomes a choice in the default-agent list. The CLI installs through
omarchy-install-hermes-cli rather than a bare `mise use`, so its interpreter
is pinned before mise builds it.

Rebased onto quattro. Ori claimed U+E909 in #7709 while this branch was open,
so the Hermes mark moves to U+E90A in the icon font, the menu entries, the
font README, and the charset the menu test pins. The glyph outline itself is
unchanged; it is spliced in beside Ori rather than over it.

Co-Authored-By: witcheer <witcheer.eth@gmail.com>
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SySdB3RtCA8BNv6Am246BP

bin/omarchy-agent

@@ -86,6 +86,15 @@ codex)
   command=(codex --approve-for-me)
   [[ -n ${prompt:-} ]] && command+=(-- "$prompt")
   ;;
+hermes)
+  # Hermes has no "start interactive, seeded with this prompt" mode. --oneshot
+  # answers the prompt and exits, which is the closest it offers.
+  if [[ -n ${prompt:-} ]]; then
+    command=(hermes --yolo --oneshot "$prompt")
+  else
+    command=(hermes --yolo)
+  fi
+  ;;
 omp)
   command=(omp --auto-approve)
   [[ -n ${prompt:-} ]] && command+=(-- "$prompt")