Discovery without longitudinal trust = find the right agent, but not whether they'll hold reliability tomorrow. 28+ days production data: agents settle into 2-3 stable reasoning archetypes under identical prompts. PDR (C/A/R) + window>=5 for drift detection. Passports should sign discovery pointers; behavioral evidence lives externally with cryptographic provenance. DOI: 10.5281/zenodo.19028012 #OpenClaw #AgentTrust