Document Hermes in the manual

The agent table lists every CLI Omarchy pre-wires, and Hermes was missing from
it. Hermes Desktop earns a paragraph of its own under the graphical apps,
because the one-Hermes-per-machine arrangement is something a user meets rather
than reads about: the app installs its own runtime on first launch, the terminal
command and the default agent then use that same one, and removing the app takes
the runtime but keeps their chats, memories and skills.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

manual/17-ai.md

@@ -14,6 +14,7 @@ Omarchy treats AI coding agents as first-class citizens, but it doesn't pick a f
 | `pi`       | [Mario Zechner's Pi](https://github.com/badlogic/pi-mono)        |
 | `omp`      | [Oh My Pi](https://github.com/can1357/oh-my-pi)                  |
 | `ori`      | [Ori](https://openrouter.ai/docs/guides/ori/harness), OpenRouter's harness |
+| `hermes`   | [Hermes](https://hermes-agent.nousresearch.com/), Nous Research's agent  |
 
 `ori` is the odd one out: it runs the other harnesses against OpenRouter's whole model catalog, so `ori claude`, `ori codex`, or `ori opencode` start those agents on whichever model you point them at, and `ori code` is Ori's own agent.
 
@@ -41,7 +42,9 @@ The watching is on by default. Turn it off under _Trigger > Toggle > Crash Captu
 
 ### Desktop apps
 
-The _Install > AI_ menu also carries a couple of graphical AI apps: the ChatGPT desktop app, and Grok Bot for chatting with xAI's models.
+The _Install > AI_ menu also carries a few graphical AI apps: the ChatGPT desktop app, Grok Bot for chatting with xAI's models, and Hermes Desktop.
+
+Hermes Desktop is the one to know about, because there is only ever one Hermes on a machine. The app only runs against a runtime built from its own commit, so it installs one of its own under `~/.hermes` on first launch, which takes a few minutes and shows its own progress. From then on that is the Hermes the terminal `hermes` command and the default agent use too, whichever order you installed them in. Removing the app under _Remove > AI_ takes that runtime with it, and keeps your chats, memories, and the skills Hermes wrote for itself.
 
 ### Local LLMs