A.19.USCM:10 - Rationale

Scoring is a frequent source of semantic precision loss: it is easy to smuggle normalization, illegal arithmetic, implicit thresholds, and uncertainty coercion into “a simple scoring function.” USCM prevents that by forcing a clean boundary:

• Admissibility first: all transforms are justified by CG‑Spec.SCP and CSLC.
• No hidden steps: normalization is explicit (UNM), aggregation is explicit (ULSAM), ordering is explicit (CPM/SelectorMechanism).
• Uncertainty is visible: admissibility is tri‑state; unknown is not coerced.
• Audit is minimal yet decisive: effective editions and effective evidence policy are always traceable.

This increases both evolvability (stable interface, externalized method semantics) and didactic usability (a single place to learn USCM’s boundary and obligations).