Test-only approval commit after the 21fe7a2 main merge (sw-test-regression-
baseline section 9); no protected path changes, no Story change.
- approvedMainCommit c73f043 -> 21fe7a2.
- public-api.approved.json kept: the public .d.ts files are byte-identical.
- docs/sw/sw-property-counts-hover-2026-10-21.md: change and verification.
