Data and code for "Strongly symmetric pair-flip Toom dynamics: parity-protected defects as branching annihilating random walks"

Data and code for the manuscript "Strongly symmetric pair-flip Toom dynamics: parity-protected defects as branching annihilating random walks" by Zhouyu Liu (Northeastern University, Shenyang, China). The study simulates the strict pair-flip version of Toom's rule with parity-preserving plaquette scrambling, a strongly Z2-symmetric Markov dynamics introduced in arXiv:2605.29113, on large tori, on W x infinity strips and on the unbounded plane. It measures the single-defect kinetics, the growth from a single defect, the finite-size drift of the apparent threshold, the chill and interpolating rules, and an even-sector test. The archive pairflip_toom_data.zip contains:- the simulation code (Python/Numba) and its correctness tests;- the raw data (JSON and JSON Lines, one record per run or seed);- the analysis scripts and their outputs, including the frozen predictions and the verdicts of all pre-registered tests;- the pre-registration documents with their dated revisions, freeze records and SHA-256 hashes, and the result write-up of each round;- the scripts that regenerate figures 1-6 and the quoted numbers of the manuscript. README.md describes the layout and how to reproduce the manuscript; verify_frozen_hashes.py checks the hashes recorded in the pre-registration documents. The documents were written in Chinese and are provided as complete English translations; files covered by a recorded hash are kept byte for byte. Run logs are not included. Tested with Python 3.12.3, NumPy 2.5.3, SciPy 1.18.1, Matplotlib 3.11.2 and Numba 0.67.0.