The plans were AI-readable implementation walkthroughs for features
that are now shipped (multi-branch picker, collection expansion,
pzmm conflict/typing). The matching specs in docs/specs/ remain as
the canonical decision record; the plans are operating recipes that
have served their purpose. Git history still has them.
Also delete the four 2026-05-01 one-shot deliverables (a11y audit +
changes, brand tokens + changes). They captured the audit moment
and the applied diff; both are now in commit history.