The Standard Coherence Fidelity Layer (SCFL) v1.0: A Substrate-Agnostic Measurement Specification for Collapse Proximity and Early Warning

SCFL v1. 0 is the normative measurement specification for quantifying system proximity to collapse through deformation-based recoverability metrics. It defines four frozen canonical primitives: seams, displacement, deformation, and recoverability (ρ). Core equation: ρ (t) = 1 − Fₙorm (t), where Fₙorm is normalized deformation. ρ is bounded 0, 1, monotonic, and approaches 0 at the collapse boundary. Regime classification: Green (ρ > 0. 70), Yellow (0. 50 < ρ ≤ 0. 70), Orange (0. 30 < ρ ≤ 0. 50), Red (ρ ≤ 0. 30). Detection threshold: ρ = 0. 50. ERCOT Demonstration (April 7–8, 2026): Applied to publicly available grid frequency telemetry. Seam: generation-load exchange boundary. Displacement: frequency deviation from 60. 00 Hz. Deformation: 300-second trailing RMS (causal, 1 Hz). Result: 47-minute lead time between ρ = 0. 50 threshold crossing (07: 50 UTC) and observed system disruption (08: 37: 12 UTC). Proof-of-concept; requires replication across independent events and domains. Constitutional Invariants: Cross-framework transduction, dimensional invariance, normalization invariance, operator-family sufficiency. Violation of any invalidates SCFL in that context. Substrate-agnostic: Applicable to power grids, AI systems, healthcare infrastructure, institutional operations. Theoretical seam sketches provided for AI (logit divergence dynamics) and hospital systems (staffing-capacity coherence). Limitations (§11): Single-event demonstration requires validation across five critical dimensions—window sensitivity, Tier 2 boundary robustness, operator-family stability, seam reproducibility, regime threshold calibration. A worked seam elimination example and Yellow-regime analysis are pending. Pre-Registered Ablation Protocol (Appendix A): Five ablation axes are pre-registered to test measurement-layer invariance under perturbations: 1. Deformation Operator Ablation: Trailing RMS, MAD, L2 norm, EWMA tested on same signal. Output: ρ-crossing time stability across operator family. Tests whether 47-minute lead time is operator-specific or invariant. 2. Window Length Ablation: 60 s, 120 s, 180 s, 300 s, 600 s windows (trailing RMS fixed). Output: sensitivity of ρ-crossing time; identification of stable region. Tests whether lead time is window-robust. 3. Seam Choice Ablation: Generation-load boundary (canonical) vs. inter-regional transmission seam. Output: Δt differences and regime consistency. Tests seam reproducibility criterion (§5. C). 4. Boundary Condition Ablation: Tier 1 empirical Fₘax vs. Tier 2 provisional F*ₘax (Winter Storm Uri, Feb 15–16, 2021 peak deformation). Output: ρ-crossing time stability under boundary uncertainty. Tests whether Fₘax circularity concern disappears. 5. Regime Threshold Ablation: Detection thresholds at ρ = 0. 55, 0. 50 (canonical), 0. 45. Output: detection-timing sensitivity and false-positive trade-offs. Tests calibration of GYOR boundaries. Status: No ablation results are reported in v1. 0. Protocol is pre-registered; results will be published in subsequent validation work. Stability across all five axes is the minimum condition for claiming measurement-layer invariance. Falsifiability: SCFL fails if invariants violate, regime boundaries produce contradictory classifications, ρ increases without reset, or lead-time thresholds fail to precede collapse events across independent cases. Open specification: CC-BY-4. 0. Replication, critique, and extension encouraged.