docs(todo): one manual-testing parent, and remove the last false bylines

The maintenance console's in-person checklist was a second top-level "Manual
testing and validation" task. It is now a child of the one parent, so the
pending checks live in a single place rather than two the agenda shows apart.

The audio doctor moves to [#B]. Its spec is written and Phase 0 shipped; six
decisions are all that stand between it and a build, which is active backlog
rather than parking lot.

Four dated artifacts still credited a co-author who is not a person. They are
records, but they are tracked and would publish, so they carry one author now
like everything else.

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