Before, `agent-browser find role button --name Submit` errored at the
daemon side with the cryptic `Unknown subaction: --name`. Now it errors
at parse time with the offending flag echoed back, the list of valid
actions (click, fill, check, hover, text), and a "Did you mean" hint
showing where to put the action verb.
Backwards compat: `find role button` (no flags, no action) still
defaults to click — only `--xxx` in action position errors.
leeguooooo
6c556e519d