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Library / First Principles Framework (FPF) - Core Conceptual Specification
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A.19.ULSAM:10 - Rationale (didactic, informative)

Aggregation is a semantic commitment: it changes a set/vector of measures into a single measure, and therefore changes what later comparison/selection can legitimately claim. In CHR, that commitment must be explicit, admissibility-gated, and auditable.

Keeping ULSAM as its own mechanism preserves:

  • the strict boundary between method choice (SoTA packs) and operation declaration,
  • the strict boundary between planned baseline (pins chosen in WorkPlanning) and run-time audit (what actually executed),
  • and the engineer-facing clarity that “we folded here, not everywhere”.