[athal7]

freebuff "fix the flaky login test" exits with:

error: command-argument value 'fix the flaky login test' is invalid for argument 'command'. Allowed choices are login, doctor.

The Freebuff branch of parseArgs declares its positional with
choices(['login', 'doctor']), so validation runs before the prompt is used.
The TUI already accepts an initialPrompt threaded from parseArgs into the
chat component, but the return object hardcodes
initialPrompt: !isFreebuff && args.length > 0 ? ... : null, so a Freebuff
build can never set it from argv.

That blocks launchers. Agent of Empires starts an agent in a tmux pane with
--extra-args appended to the launch line, and its dotfiles already pass a
first task that way for other agents (-- '<prompt>'). For Freebuff there is
nothing to hand the task to, so the only workaround is typing into the TUI,
which is what a launcher exists to avoid.

This change accepts bare words as the initial prompt the way the Codebuff
branch already does, and keeps login and doctor as commands:

argv	parsed
freebuff "fix the flaky login test"	initialPrompt: "fix the flaky login test"
freebuff login	command: "login", initialPrompt: null
freebuff --trust-agents fix it	trustAgents: true, initialPrompt: "fix it"

Tests: four cases in cli/src/__tests__/cli-args.test.ts covering those shapes
and the unchanged Codebuff path. No dependency changes.

I ran them with bun test against the patched parser (21 pass, 0 fail) by
stubbing only the two workspace imports, since no bun install was available
locally; public CI will run the real suite.