Code review comment for lp://staging/~facundo/tanuki-agent/full-binary-and-instructions

Thanks, Facundo. Almost there for the owned-snap-update use-case. Definitely ready for another full pass without context (Bret is probably doing it tonight).

Minor nitpick, we should settle with '.tgz' or '.tar.gz' extension for uniformity (I vote for the latter, in this case we have to tweak the tutorial and the Makefile).

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