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

default/fonts/omarchy/README.md

@@ -12,6 +12,7 @@ The private-use glyphs in `omarchy.ttf` are:
 - `U+E907` — Ollama, from <https://simpleicons.org/icons/ollama.svg>
 - `U+E908` — T3 Code, traced from the app icon in <https://aur.archlinux.org/cgit/aur.git/plain/t3code-icon.png?h=t3code-bin>, since upstream publishes no monochrome SVG
 - `U+E909` — Ori, from <https://openrouter.ai/brand/v2/openrouter-glyph-dark.svg>, OpenRouter's own mark: Ori ships no separate logo and its product page uses this one
+- `U+E90A` — Hermes, traced from the Hermes app icon (<https://hermes-agent.nousresearch.com/>), the same art the `hermes-desktop` package ships as its icon
 
 The agent marks are monochrome so the menu can render them using the active
 theme's foreground and selection colors.