docs(task-audit): add tag-vocabulary enforcement and verify-then-close

Two Phase C behaviors, both surfaced auditing an Emacs-config todo.org. Enforce a project's declared closed tag set (strip tags outside it) where the legend marks the set exhaustive, leaving open-vocabulary projects untouched. For a task whose code shipped but awaits a manual or visual check, file that check under the project's manual-testing parent (dedup first) and close the implementation task, rather than letting "done but unverified" linger half-open.

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