Tab insides, step 4: a style ratchet in CI

[jfillman]

Step 4 of HANDOFF-tower-tab-insides: the ratchet.

• scripts/style-ratchet.mjs (yarn ratchet, new CI step after Lint): counts local styles outside src/ui that redo a kit piece (section titles, tables, facts, notes, cards, banners, headline numbers, hand-rolled sky links, radii off the 6/4 scale) and fails if any count goes up. Baseline 119 (was 328 before this pass); --update writes a lower baseline.
• Also fails on a class name used without a style in its sheet, local or borrowed from another file (tsc cannot see these; steps 1/2 left three, fixed in Tab insides, step 3: Card, Tile, Callout, Stat; SLOs and the ArgoCD warning #83). Known false positives (a variable name reused for two sheets) are in the baseline.
• Probed both ways: removing a shared break-glass style fails with the two files that use it; adding a local sectionTitle fails with the list.
• docs/design-system.md: inside of every tab marked done; how to run and update the ratchet.

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