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Library / First Principles Framework (FPF) - Core Conceptual Specification
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A.6.B:4.3 — Canonical placements in the Signature Stack

The quadrants have canonical placements in the boundary stack:

  • L → Signature layer: U.Signature.Laws (and mechanism‑local semantic laws if present).
  • A → Mechanism layer: U.Mechanism.AdmissibilityConditions (entry gates / runtime admissibility predicates).
  • D → Deontics & Commitments layer: atomic claims about a generic prescription or about one separately obtaining individual duty, recommendation-as-duty, prohibition, or commitment. When permission wording is live, §8.4.1 decides whether its claim also belongs here.
  • E → Work-Effects & Evidence layer: truth-conditional claims whose satisfaction requires actual work, evaluation, observation, or produced carriers.

A publication face MUST NOT introduce new semantic claims outside this L/A/D/E-classified claim set. E.17 (MVPK) enforces this rule for publication faces and their selected profiles.