One command to your fleet

Help me set up Ferretry on this computer. Follow these rules exactly.

How to talk to me
- Whenever I need to do something, reply in exactly this shape, then stop and wait:
  **Run this**
  ```bash
  <the exact command(s), nothing else>
  ```
  **Why:** <one short line>
  **What you'll see:** <one short line>
- One action at a time. No paragraphs, no repeated caveats.
- Report what you find in 3 to 5 short lines, then your recommendation.

What you may run
- Only read-only checks and the fy commands named below. I run every install, update, sudo or service command myself.
- Claude Code: tell me to type the command after a ! in this chat. Codex: tell me to run it in my own terminal, and hand me any check your sandbox blocks.
- Anything that needs sudo goes in my own terminal.
- If a command is blocked or fails, tell me the error in one line and stop. Never retry it or look for a way around it.
- Never print, save or ask for a token, a secret or a pairing code.

1. Look around (read-only; an error just means "not there"):
   uname -sm
   command -v brew nix fy home-manager darwin-rebuild
   fy onboard --check --json
   If that says "complete": true, go to step 3. Otherwise recommend ONE way to install with a one-line reason, list the others one line each, and let me choose:
   - Homebrew, if brew is there: easiest updates.
   - Home Manager or nix-darwin, if I use one: it lives in my config.
   - nix profile, if nix is there: one command, no config.
   - Installer, otherwise: one line, nothing else needed.

2. Hand me ONE "Run this" for my choice.
   Homebrew:
     brew tap kirinnee/ferretry https://github.com/kirinnee/ferretry
     brew install --cask ferretry
     fy onboard --yes
   nix profile:
     nix profile install github:kirinnee/ferretry
     fy onboard --yes
   Home Manager or nix-darwin: first show me where these two lines go in my flake.
   Then hand me the rebuild (home-manager switch --flake . or darwin-rebuild switch --flake .) and fy onboard --yes:
     inputs.ferretry.url = "github:kirinnee/ferretry";
     home.packages = [ inputs.ferretry.packages.${pkgs.stdenv.hostPlatform.system}.default ];
   Installer:
     curl -fsSL --connect-timeout 30 --max-time 600 https://github.com/kirinnee/ferretry/releases/latest/download/install.sh | bash
     PATH="$HOME/.local/bin:$PATH" fy onboard --yes

3. Check: run fy onboard --check --json. Read the steps and remedies. If incomplete, show the next remedy and wait. --yes leaves missing steps for later; it does not install or import.

4. Pair my phone: hand me fy pair as a "Run this" for my own terminal, not this chat, so the code never reaches you. What I'll see: a QR code to scan with my phone's camera within two minutes.

5. Stop. Afterwards, only when I ask: fy daemon status, fy login ls, fy runtime ls, fy runtime link claude or fy runtime link codex, and fy onboard (it asks questions, so I run it in my own terminal).
   To update later: fy update, or the Update button in the app.