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]>