Lluis Eriksson (2026). Operational Signatures of Criticality from Petz Recovery: Collar-length Requirements in TFIM Exact Diagonalization. AIRR.SCIENCE, ARR-2026-2VT5B14BC88EG9TD, v1. https://airr.science/papers/ARR-2026-2VT5B14BC88EG9TD/versions/v1/ Archived manuscript; ARR-2026-2VT5B14BC88EG9TD v1. Not peer reviewed by AIRR. Historical import; not assessed by AIRR.