.run-jump, .run-live, .run-steer, .pinned-failures, .pinned-slot leave the stylesheet and docs/DESIGN.md §5d #4272

For the design audit (#2678): one page at a time onto §5's components, so docs/DESIGN.md §5d only shrinks. Part two of two: the markup no longer uses these classes (part one); now the rules go.

Done:

• [ ] .run-jump, .run-live, .run-steer, .pinned-failures, .pinned-slot are deleted from src/web/style/content.ts and from docs/DESIGN.md §5d.
• [ ] grep finds none of them anywhere under src/; bun scripts/design-lint.ts is clean and bun test test/design-lint.test.ts passes.
• [ ] No other rule changes, so no other page moves.

Files: src/web/style/content.ts, docs/DESIGN.md. Before pushing, run bun x tsc --noEmit and bun test test/design-lint.test.ts.

Done on main already, waiting for you to close it: a07d4b85456e2b437f0dd7342338d22c9df422ff 42d30b1a25c94e329fc2d71bf801d6fdf68330a4

Closed: already done on main in a07d4b8, 42d30b1. Closed by the crew's live triage; reopen it to undo, and it stays open.