Build the canonical Phaeozem fixture — make_phaeozem

Synthetic humid-temperate Phaeozem on non-calcareous loess: mollic (chroma 2, value 2-3) and high BS, but no secondary carbonates anywhere – typical of more leached / less-arid steppe-forest transition. By construction:

mollic: PASSES.
phaeozem: PASSES.
chernozem, kastanozem: FAIL (no carbonates).

Usage

make_phaeozem_canonical()

Value

A PedonRecord.