Supplementary verification package S1
Manuscript: "When Does the Non-Hermitian Effective Description Fail? A Finite-Size Reliability Map" (revision 2)

Contents
- scripts/    : all verification and figure-generation code (Python 3.12; numpy, scipy, sympy, mpmath)
    verify_small.py   - platforms A/B/C, alternative protocol, thermal states, window scans
    verify_chain.py   - XX chains N=2-7 exact, corner space N=8,10,12, fits, threshold consistency
    final_data.py     - conventions grid (576), pointwise deviations, platform-C EP section
    sympy_check.py    - symbolic checks C1-C5 (Appendix C)
    make_figs_run.py  - regenerated Figures 1,2,5,7,8,9
- data/       : all numeric outputs used in the revised text
- logs/       : raw run logs of every script
- figs/       : regenerated figures (300-dpi PNG)
- manuscript_final.md : full source of the revised manuscript

Fixed seeds are registered inside the scripts; every number quoted in the
revision reproduces from this package.
