Add the disclosure-controlled public certificate, chain, CRL and status
repository with capability-based unlisted access, bounded streaming,
conditional caching and isolated public execution resources.
Introduce authoritative issuer generations and explicit chain paths so
issuance bundles and stable public chain routes never rely on inferred
certificate ordering or runtime path guessing.
Support explicit direct-mTLS and trusted-reverse-proxy authentication
modes with mutually authenticated backend transport.
Keep proxy and end-client principals separate, validate forwarded
certificates independently, and enforce narrowly scoped forwarding
authority for RFC 9440 and NGINX escaped-PEM profiles.
