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

test/shell.d/menu-test.sh

@@ -224,6 +224,7 @@ const expectedAgents = {
   claude: { icon: '󰛄', label: 'Claude' },
   codex: { icon: '\ue905', iconFont: 'omarchy', label: 'Codex' },
   grok: { icon: '\ue904', iconFont: 'omarchy', label: 'Grok' },
+  hermes: { icon: '\ue90a', iconFont: 'omarchy', label: 'Hermes' },
   copilot: { icon: '', label: 'Copilot' },
   crush: { icon: '󰋑', label: 'Crush' },
 }
@@ -244,7 +245,7 @@ assertDeepEqual(
   defaultItems
     .filter(item => item.parent === 'setup.default.agent')
     .map(item => item.label),
-  ['Antigravity', 'Claude', 'Codex', 'Copilot', 'Crush', 'Grok', 'omp', 'OpenCode', 'Ori', 'Pi'],
+  ['Antigravity', 'Claude', 'Codex', 'Copilot', 'Crush', 'Grok', 'Hermes', 'omp', 'OpenCode', 'Ori', 'Pi'],
   'menu sorts coding agents alphabetically'
 )
 const expectedDefaults = {
@@ -636,5 +637,5 @@ assert(
 JS
 
 font_charset=$(fc-query --format='%{charset}' "$ROOT/default/fonts/omarchy/omarchy.ttf")
-[[ $font_charset == *"e900-e909"* ]] || fail "Omarchy icon font includes every custom menu glyph"
+[[ $font_charset == *"e900-e90a"* ]] || fail "Omarchy icon font includes every custom menu glyph"
 pass "Omarchy icon font includes the official agent marks"