doc: correct drift and move the build notes to the root

The Rsync comment about draining a hostile remote's pipe sat on the
Tally type, where it means nothing; it describes boundedLines. Scheduler
explained itself with what happened during development instead of the
constraint that WorkManager persists unique names across upgrades, and
MainActivity and SyncLog did the same. Keys pointed at a pin() that does
not exist. The App header restated the class name and omitted half of
what onCreate does. OUT_FORMAT had no caller outside its file.

The README layout list omitted fastlane. The e2e test hardcodes a copy
of the app's rsync vector with nothing saying so. useradd already writes
a locked password field, so "skip passwd -l" does not leave a non-locked
one and key auth is still refused; verified against sshd with UsePAM no.
The CI file also runs verify-repro on a tag, and the NDK and build-tools
are pinned by revision and verified against Google's manifest rather
than a checksum this repository owns, which the reproducibility notes
claimed for every input.

metadata/ held one document and nothing else, and reads as a store
metadata directory beside fastlane/metadata. Root, extensionless,
beside THIRD_PARTY.

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