he SCFL Invariant Framework — Formal Specification v1.0 is the frozen, canonical definition of the invariant structure underlying the Standard Coherence Fidelity Layer (SCFL). This artifact formalizes the mathematical, structural, and operational rules governing how invariants are defined, evaluated, and subjected to perturbation‑based falsification within SCFL’s coherence‑physics architecture. The specification includes: A complete invariant scaffold, defining agents, state spaces, interaction graphs, and admissible policy classes The SCFL Property Set (P1–P6), expressed as constraint‑plus‑proxy formulations suitable for empirical testing Collapse criteria and rupture‑layer conditions, enabling detection of drift, deformation, and instability The admissible region 𝒵, defined as the set of trajectories satisfying SCFL’s invariant constraints under the frozen perturbation family A sufficiency‑shaped statement, linking invariant‑induced policies to measurable coherence, recoverability, and spoof‑resistance Formal definitions of SCFL observables (C(t), R(t), L(t)) with domain, range, and boundedness assumptions A non‑drifting, reviewer‑safe structure, ensuring that all parameters are locked ex‑ante and cannot be tuned post‑hoc This specification serves as the foundational reference for all SCFL simulations, comparative invariant testing, Tier‑0.5 demonstrations, and cross‑domain validation work. It is frozen as v1.0 and intended for archival, citation, and scientific reproducibility.