docs(docs): update documentation for tool installation and desktop app changes

docs/ai/index.mdx

@@ -5,7 +5,7 @@ sidebar:
   label: Overview
 ---
 
-The repo manages the agent skill library only. Claude Code (`~/.claude`) and omp (`~/.omp`) configs are not in this repo, and no agent CLI is installed by chezmoi. topgrade runs `omp update` as a custom command.
+The repo manages the agent skill library only. Claude Code (`~/.claude`) and omp (`~/.omp`) configs are not in this repo. omp, opencode, and crush are global mise tools (`packages.shared.mise`, installed by [15-tools](/chezmoi/scripts#15-tools)) and are updated by topgrade's `mise upgrade`; no other agent CLI is installed by chezmoi.
 
 <CardGroup cols={3}>
   <Card title="Skills" href="/ai/skills" icon="library">