feat(remote): drive a companion extension on another host through a broker

PI_CHROME_REMOTE=host:port sends every command to a broker/broker.mjs there,
with its bearer token, instead of binding a bridge on this machine. Unset, the
extension behaves as upstream. A remote session never binds or takes over a
port: when the broker is unreachable the tools fail rather than drive some
other browser.

A pi-chrome-remote prompt section says which browser chrome_* drives and how
files move to and from its host; chrome_upload_file wants absolute paths there.
PI_CHROME_AUTHORIZE grants every session up front.

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