Add install, login, logout, run, stop subcommands to `hanzo bot` for
managing local bot agent nodes that connect to gw.hanzo.bot. Browser
OAuth flow authenticates against hanzobot-client-id with dedicated token
storage at ~/.hanzo/bot/token.json. Password grant fallback via
--no-browser flag.
Normalize env var lookup: IAM_ canonical prefix with HANZO_IAM_ accepted
as backwards-compatible fallback via _env() helper in both auth.py and
bot/commands.py.
zooqueen
ed13435e6c