feat(hero): Ionic base and abacus, medallions onto the parapet face

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Detail pass on the hero, all verified by measuring the built mesh:

- Column base moulding: a 1.36 m wide, 0.22 m tall cylinder at each shaft foot
  (2.00-2.22 m). The shaft previously started straight off the square pedestal,
  so the base never read in silhouette.
- Abacus: a 1.30 m square, 0.14 m thick slab over each capital. It takes the top
  of the capital zone, so the colonnade still ends at 9.70 m and the 53.1 %
  proportion is unchanged.
- Medallions fixed: they were built with the Z-axis cylinder helper, so the two
  'discs' were pancakes lying flat on the parapet coping (1.1 x 1.1 x 0.02,
  z 14.02-14.04). New disc_on_wall() helper rotates the cylinder 90 deg about X;
  they now stand 1.1 m across on the parapet face (y -1.32..-1.28,
  z 13.05..14.15).

Hero rebuilt (95 parts, 2420 tris, still 14.50 m), re-imported, DemoMap rebuilt,
screenshot set re-rendered. Part report records the new dims and their assumption
notes. Screenshots README notes the detail pass.

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