The theme inherited Tailwind's radius scale silently, so `--radius-md` meant one thing in the editor's stylesheet and whatever the framework last shipped everywhere else. Declaring the three rungs we use gives the scale one owner: a change lands in one place, and `check-tokens` can see a misspelt rung now that `--radius-` has left its `EXTERNAL` bypass list.

The values are Tailwind's own, so nothing moves. `sm` and `md` are what the editor stylesheet already read; `lg` is the one utility site. `xs` and `xl` are not declared, because nothing uses them.

`--radius-*: initial` first: `@theme` merges with Tailwind's theme rather than replacing it, so a rung we do not declare goes on resolving to a value we never chose — and its untouched `2xl` was `1rem`, the same as an `xl` we might later pick. Reaching for a rung we do not own should draw nothing.

The bare `rounded` utility is spelled `rounded-sm` at ten call sites. Both resolve to `0.25rem`, so this is a rename rather than a change — `rounded` is the v3 name and does not appear in the scale this file now owns.

🤖 Generated with [Claude Code](https://claude.com/claude-code) ---

### Stack

Merge bottom-up. Each PR targets the one below it, so every diff reads in isolation; GitHub retargets the child automatically as each parent merges.

1. #9  — Emit all theme tokens, fix callout colours, load Inter  ←  `main` 2. #10 — Add two-stop shadow scale tokens 3. #11 — Add radius tokens and replace bare rounded classes 4. #12 — Add type scale tokens, replace arbitrary font sizes 5. #13 — Add easing and duration tokens, set transition defaults 6. #15 — Add one focus-visible outline rule for all controls 7. #16 — Scale buttons down on press 8. #17 — Add tabular-nums to figures and balance plan headings 9. #18 — Shorten empty states and composer status copy 10. #19 — Add entrance animation for newly arrived items

Plan: `docs/superpowers/plans/2026-08-04-design-token-foundation.md`