"""Relational-metric lane — the field-reasoner wedge's golded micro-domain.

A panel of forward-substitutable quantitative-relational word problems (additive /
part-whole). The system under test is the geometric FIELD reader
(``generate.relational_field_reader``), which reads problem TEXT into conformal
points on the e1 number line and reads the answer back by projective
dehomogenization. The gold is an INDEPENDENT, pure-arithmetic oracle
(``evals.relational_metric.oracle``) that computes the answer from the structured
relations and shares no code with the reader (INV-25).
"""
