manifest: add some documentation to _lazymanifest python code It was not particularly easy figuring out the design of this class and keeping track of how the pieces work. So might as well write some of it down for the next person.

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{

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    "conduit_uri": "https://phab.mercurial-scm.org/api",

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    "repository.callsign": "HG",

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    "arc.land.onto.default": "@",

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    "base": "hg:.^"

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}