Add Muse Code as a default coding agent (#9915)

* Add Muse Code as a default coding agent

Meta ships Muse Code only as a binary, so it installs from the AUR
(muse-code-bin) instead of mise, and a fresh install runs the muse login
browser flow in the install terminal before the agent opens.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0148qKzr366p2Ubu2igCLvPg

* Refine Muse Code menu and prompt forwarding

* Install Muse Code from OPR

* Install Muse Code through mise's HTTP backend

* Preinstall the Muse mise stub

* Use the shared Muse installation flow

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: David Heinemeier Hansson <david@hey.com>

bin/omarchy-agent

@@ -110,6 +110,11 @@ hermes)
     command=(hermes --yolo)
   fi
   ;;
+muse)
+  # --approval-mode never skips the tool prompts but keeps Muse's own sandbox.
+  command=(muse --approval-mode never)
+  [[ -n ${prompt:-} ]] && command+=(-- "$prompt")
+  ;;
 omp)
   command=(omp --auto-approve)
   [[ -n ${prompt:-} ]] && command+=(-- "$prompt")

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|openclaw|agy|hermes|copilot|crush|cursor-agent]
+# omarchy:args=[pi|omp|opencode|ori|claude|codex|grok|openclaw|agy|hermes|copilot|crush|cursor-agent|muse]
 # omarchy:examples=omarchy default agent | omarchy default agent codex | omarchy default agent claude
 
 installing=false
@@ -36,9 +36,14 @@ openclaw) agent="openclaw"; name="OpenClaw"; agent_installer="omarchy-install-op
 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" ;;
+muse | muse-code | musecode)
+  agent="muse"; name="Muse Code"
+  # Meta's launcher verifies and updates the native binary for this platform.
+  agent_package="http:muse[url=https://api.meta.ai/muse-launcher.sh,bin=muse,version_list_url=https://api.meta.ai/muse-code/channels/muse-stable,version_json_path=.version]"
+  ;;
 cursor | cursor-agent) agent="cursor-agent"; name="Cursor CLI" ;;
 *)
-  echo "Usage: omarchy-default-agent <pi|omp|opencode|ori|claude|codex|grok|openclaw|agy|hermes|copilot|crush|cursor-agent>"
+  echo "Usage: omarchy-default-agent <pi|omp|opencode|ori|claude|codex|grok|openclaw|agy|hermes|copilot|crush|cursor-agent|muse>"
   exit 1
   ;;
 esac

bin/omarchy-remove-preinstalls

@@ -24,6 +24,12 @@ if gum confirm "Are you sure you want to remove all preinstalled web apps, TUI w
     rm -f ~/.local/bin/cursor-agent
   fi
 
+  # Preserve a user-managed Muse launcher at the same path.
+  if [[ -f ~/.local/bin/muse && ! -L ~/.local/bin/muse ]] &&
+    grep -Eq '^mise use -g .*"http:muse\[' ~/.local/bin/muse; then
+    rm -f ~/.local/bin/muse
+  fi
+
   # Only the wrapper omarchy-install-hermes-cli wrote is a preinstall. Hermes
   # Desktop's command, an official install, or anything else at that path is
   # the user's, so it is the installer that decides whether the wrapper is its