Pi 0.85.1 and Claude Code 2.1.289 (Agent SDK 0.3.289), 34 cases against a scripted local model in a loopback-only network namespace. MATRIX.md has the command, outcome, model-visible message and fail-closed column per case, and one rely-on line per case. Evidence under evidence/. Co-Authored-By: Claude Opus 5.5 <[email protected]>