.kpi-spark leaves the stylesheet and docs/DESIGN.md §5d #4192

Part two: it starts once part one has removed these names from the markup.

Done:

• [ ] git grep each of .kpi-spark: no use is left in src/ but its rule. If one is still used somewhere, keep it and say where in the pull.
• [ ] The rules leave src/web/studio/feed_style.ts (and any reduced-motion block), and the names leave their §5d bullet in docs/DESIGN.md.
• [ ] Run bun scripts/design-lint.ts --update and commit docs/design/baseline.json only if the count goes down or stays equal. bun test test/design-lint.test.ts passes.

Files: src/web/studio/feed_style.ts, docs/DESIGN.md, docs/design/baseline.json. Before pushing: bun x tsc --noEmit and bun test test/design-lint.test.ts. Rebase right before pushing: DESIGN.md changes under everyone.

Parked by the crew: the run ended without a pull: declined: .kpi-spark is still in use, so the rule and its §5d name have to stay. That leaves nothing for this issue to change.