Data, code, and Supplemental Material for: Quantum measurement as a dynamical symmetry breaking: pointer selection and Born-like statistics in a closed spin system

This deposit contains the processed observables, per-trajectory classifications, fit inputs, and the analysis and plotting code behind every figure and every quoted number of the manuscript *Quantum measurement as a dynamical symmetry breaking: pointer selection and Born-like statistics in a closed spin system* (A. K. Nguyen, 2026), and its Supplemental Material. The model is a measured spin-1/2 coupled to a ferromagnetic apparatus of N_A spins and a spin-glass environment of N_E spins, closed by one nonlinear mean-field term on the apparatus; the full wavefunction is propagated by Chebyshev polynomial expansion to Hilbert dimension 2^28. The deposit also contains the Fortran simulation source and the complete parameter files of every production, control and convergence run quoted in the paper. The raw wavefunction trajectory output is not deposited owing to its size; it is available from the author on request, and a per-trajectory SHA-256 manifest is included so that any supplied trajectory file can be checked against the one used in the analysis. The model originates in the 2008 preprint arXiv:0809.1575.