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-default-agent

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # omarchy:summary=Set and launch the default coding agent
-# omarchy:args=[pi|omp|opencode|ori|claude|codex|grok|agy|copilot|crush]
+# omarchy:args=[pi|omp|opencode|ori|claude|codex|grok|agy|hermes|copilot|crush]
 # omarchy:examples=omarchy default agent | omarchy default agent codex | omarchy default agent claude
 
 installing=false
@@ -33,20 +33,36 @@ codex) agent="codex"; name="Codex" ;;
 crush) agent="crush"; name="Crush" ;;
 grok) agent="grok"; name="Grok"; agent_package="npm:@xai-official/grok" ;;
 agy | antigravity | antigravity-cli | gemini | gemini-cli) agent="agy"; name="Antigravity"; agent_package="antigravity-cli" ;;
+hermes) agent="hermes"; name="Hermes"; agent_installer="omarchy-install-hermes-cli" ;;
 copilot | github-copilot) agent="copilot"; name="GitHub Copilot" ;;
 *)
-  echo "Usage: omarchy-default-agent <pi|omp|opencode|ori|claude|codex|grok|agy|copilot|crush>"
+  echo "Usage: omarchy-default-agent <pi|omp|opencode|ori|claude|codex|grok|agy|hermes|copilot|crush>"
   exit 1
   ;;
 esac
 
 agent_package=${agent_package:-$agent}
 
-if [[ $installing == "false" ]] && ! mise where "$agent_package" &>/dev/null; then
+# Hermes reaches mise through its own installer rather than straight from
+# here: it needs its interpreter pinned, and a bare `mise use` has nowhere to
+# say so. See omarchy-install-hermes-cli.
+if [[ -n ${agent_installer:-} ]]; then
+  # Not omarchy-cmd-present: the stub is on PATH from first boot and says
+  # nothing about whether Hermes is installed behind it. Treating a cold stub
+  # as installed skips the floating terminal and runs the minute-long install
+  # inside the menu action instead.
+  agent_present() { "$agent_installer" --check; }
+  agent_install() { "$agent_installer" --now; }
+else
+  agent_present() { mise where "$agent_package" &>/dev/null; }
+  agent_install() { mise use -g "$agent_package"; }
+fi
+
+if [[ $installing == "false" ]] && ! agent_present; then
   exec omarchy-launch-floating-terminal-with-presentation omarchy-default-agent --install "$agent"
 fi
 
-if ! mise use -g "$agent_package"; then
+if ! agent_install; then
   if [[ $installing == "true" ]]; then
     echo "Could not install $name with mise" >&2
   else