{"id":"perimeter-defense-ensures-data-quality","text":"The codebase's perimeter defense model — normalize inputs once at system boundaries, then trust all internal callers — ensures internal operations work on clean, canonical data throughout the processing pipeline.","truth_value":"IN","source":"","source_url":"","source_hash":"","justifications":[{"type":"SL","antecedents":["normalize-once-at-system-boundary","callers-trusted-at-internal-boundaries"],"outlist":["proximity-no-coordinate-validation"],"label":"perimeter defense holds only if ALL boundaries validate; proximity services accept garbage coordinates, breaking the invariant"}],"dependents":["boundary-normalization-serves-defense-and-correctness","perimeter-defense-enables-cheap-writes"],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[]}}