APR-Lite Phase 30: MSSP Registry and Five-Surface Access Architecture

This technical note documents Phase 30 of APR-Lite, a governance substrate for agentic AI systems. Phase 30 introduces the MSSP (Managed Security Service Provider) registry, a five-surface access architecture with legally grounded credential separation, and two new user interfaces: the MSSP Console and the Auditor Portal. The phase implements the constitutional completeness model described in the companion paper (DOI: 10.5281/zenodo.19380074), specifically the structural separation between the party that operates the governance substrate (the MSSP) and the party that independently verifies its governance record (the auditor). This separation is enforced at the database schema level, the worker credential model, and the interface codebase — not by policy recommendation. The phase also documents the System Sentinel attribution model for substrate-generated governance events, the storage architecture implications of hash-chained event records, and the pricing model implications of agentic workflow volume as the primary storage driver.