A Unifying Cross-Platform Protocol for Floquet Plateaus: R ≈ 1, Dual-Channel Co-Lock, and Falsifiable Tests

This work reports an operational, cross-platform protocol for reading a quantized plateau using a single measurable slope SSS and a single lock condition R≡D/O≈1R \equiv D/O \approx 1R≡D/O≈1. The method centers on a flat window (not a knife edge), maintains a periodic steady state with an open Floquet gap, and requires broken time-reversal symmetry. A tiny magnetic-field dither yields S; a tiny drive dither provides an odd centering signal. A dual-channel co-lock with a power-flow marker (P_pump) enforces matching onset, hysteresis, and discrete jumps at gap closure. Acceptance lines demand plateau flatness within 2%, an odd component near zero at the center, an open gap proxy, sign reversal under chirality or B-flip, and protocol invariance. Hall is the reference platform with published defaults, and the same grammar applies to optics and cold atoms. A probability-gate controller (SPRT/CUSUM options) automates centering and drift handling under thermal guardrails. The approach is falsifiable and reproducible: it supplies explicit tests, co-locking, and reporting rules, and can be used without committing to any specific theoretical derivation.