The legacy icon set is fully paid down, so the ratchet had nothing left to
ratchet: BaselineIsWellFormed required the baseline to be empty, which made
the baseline file, the stale-entry diff and the entry-format regex
unreachable. The rules are enforced directly now.
- AssetsFollowTheRules fails on any violation of collectViolations().
- tests/icon_assets/icon-baseline.txt is gone with its reader.
The icon rules were enforced by review only, so the next Inkscape export could
reintroduce a baked fill or a physical size without anyone noticing.
Add a test that rejects non-24 viewBoxes, physical sizes, editor metadata,
hardcoded paints, missing tokens, color-coded filenames, and rasters. Keep the
legacy baseline empty so the ratchet can only tighten.
