Level 0 SIT: A Physical-Frame Model and Condensate-Source Falsification Contract

This model-and-methods paper develops a falsifiable Level 0 surface for Super Information Theory. It specifies the physical matter frame, separates the proposed scalar sector from ordinary electromagnetism, defines the condensate observable through the Penrose-Onsager criterion, and introduces one explicit condensate-source hypothesis. The release includes reproducible null, finite-source, and uncertainty benchmarks together with clear failure conditions. The paper reports no measured anomaly, validated physical SIT effect, constraint-cleared parameter region, or calibrated experimental sensitivity. Its contribution is a source-explicit linear-response model and a bounded contract showing what later calculations or experiments would need to test or exclude.