Tiro CLI をエージェントにインストールする

Install the Tiro CLI in this environment and sign me in.

  Package    :  @theplato/tiro-cli  (Node.js 20+)
  Platforms  :  macOS, Linux, Windows
  Auth       :  OAuth (Authorization Code + PKCE) — opens a browser
                and stores the token in the OS keychain.

Steps:
  1. Install globally with whichever package manager is already in
     use here. For npm, that is:
       npm install -g @theplato/tiro-cli
     (Use pnpm / yarn / bun equivalents if those are the active
     package manager — do not switch tooling.)
  2. Verify the install:
       tiro --version            # expect 0.3.1 or later
  3. Sign me in:
       tiro auth login           # opens a browser for OAuth
  4. Confirm the session:
       tiro auth status          # shows user + token prefix only

If this is a headless / CI / sandboxed environment without a browser,
do not run `tiro auth login`. Instead, ask me for a TIRO_TOKEN value
and export it for subsequent commands:

  export TIRO_TOKEN="<paste-token-here>"

When everything is connected, run:

  tiro notes list --limit 3 --json

and show me the output to prove the CLI is working. If any step
fails, show the exact command, the exit code, and the error — do
not retry silently.