Representation Stability Is Not Detectability: A Leakage-Free Evaluation of Frozen Time Series Foundation Models for Anomaly Detection under Concept Drift

Code and aggregate-result package for the Applied Soft Computing manuscript "Representation Stability Is Not Detectability: A Leakage-Free Evaluation of Frozen Time Series Foundation Models for Anomaly Detection under Concept Drift" (Ms. Ref. ASOC-D-25-13487). It implements the Constrained Low-Resource Adaptation (CLRA) protocol and supports a leakage-free negative/diagnostic evaluation of frozen TSFM forecast features for anomaly detection under concept drift. The package contains source code, configurations, scripts, tests, dependency manifests, and compact aggregate CSV outputs. Raw datasets, model checkpoints, caches, local secrets, and per-seed run logs are intentionally excluded. This version supersedes the initial record (v1), whose code contained a validation/test-label threshold-leakage bug.