v0.29.1 quackd onboard takes a brain on a server of your own with no key

quackd onboard preflight failed a brain on a model server of your own that takes no key, though
the wizard sets one up that way, and quackd onboard demo --llm refused one too. Both take it now,
and a hosted brain still needs its key. Preflight also says where a missing brain goes, and sends
nobody to a service that cannot start: on a computer no board knows it names none, and on a Jetson
it offers quackd onboard serve beside the unit. An install rehearsal of 0.29.0 led to all three.
docs/passport/quackd.md
says what JetPack 6 needs to install it, and
the roadmap
says what ran in an arm64 container with JetPack 6's userland, which is as near as the onboard
side has come to a Jetson.

Ten distributions, one version between them: quackd, quackd-microduck, quackd-lerobot,
quackd-rosbridge, quackd-open-duck, quackd-xlerobot, quackd-alohamini, quackd-toddlerbot,
quackd-huebot and quackd-moss. The full note is in
CHANGELOG.md.