#!/usr/bin/env python3
"""
N7 — TOY-DSW: THE KINEMATICS OF THE FEE
=========================================
Folio VII addendum. Which-path decoherence D(t) of a single-system
superposition (branches at X(t) +/- Delta/2) sourcing the 3D massless
lattice field. Exact mode dynamics, compact boson, L=24.

MEASURED (eps=0.1, ramp 15, window t in [40,92]):
  static:               slope = -8e-9   -> exactly free (amendment holds)
  inertial v=0.1..0.45:  slope 5e-5 .. 2e-3, smooth in v, NO threshold
                        -> lattice Cherenkov: phase velocity spans
                           (2/pi, 1), so any motion outruns some modes.
                           A Lorentz-violating vacuum bills motion itself;
                           a Lorentz-invariant one bills only acceleration.
                           (=> drag bounds on moving matter bound vacuum
                            discreteness; cf. pulsar braking lore.)
  oscillating:          linear billing (radiation), rate scalings
                        lattice-dominated (A-exp 0.63, Delta-exp 1.5,
                        not continuum dipole) — filed, not claimed.

Open gate unchanged: derive the continuum DSW rate from the measured
T_L schedule. Data: n7_dsw_toy.json.
"""