Stability checkpoint v0.7.4 — per-issuer JSON config (ADR-0044). SECURED_CLAUDE_IDP_CONFIG JSON list lets each issuer have its own audience/bearer/mTLS/TTL — multi-tenant SaaS with mixed-auth modes unlocks. 12 new tests, 253 total, 91.51% coverage. See ADR-0044 for schema + use cases.