Energy Filament Theory (EFT) A7: Boundary Scanning Protocol Family — Reversible Boundary/Threshold Scans with Triad Residual Fingerprints

This record publishes EFT-A7, the “Boundary Scanning Protocol Family” in the EFT methods-layer protocol library. A7 standardizes an auditable workflow for reversible scans of boundary conditions and external controls across cavity QED, Dynamic Casimir platforms, Josephson-junction systems, strong-field turn-on (Schwinger limit), and reversible boundary remodeling. The target fingerprint is a triad residual fingerprint: threshold discreteness (segmented plateaus), chain rewriting at thresholds (multi-channel co-appearance/reordering), and closure of three residual channels by a single common term (Ĉ). A7 hard-locks three guardrails (reversibility, triad alignment & single-Ĉ closure, and readout-independence/no-medium controls) and aligns to the audit clause Z13/T2.