d616d4ca50
Rewrite the Agent Note's Decision/Resume/front-door/Consequences sections and
its Chinese pair in present tense, dropping changelog phrasing ("X replaces an
earlier Y", "retired the env var", "which the merge brought in", "Anyone who
ran X now uses Y", "an earlier revision dispatched..."). The note now introduces
the current grammar directly; Problem and Alternatives keep the motivation and
rejected designs the format requires.