Replace MCR's custom auth, admin, and logging interceptors with the
shared mcdsl grpcserver package. This eliminates ~110 lines of
interceptor code and uses the same method-map auth pattern used by
metacrypt.
Key changes:
- server.go: delegate to mcdslgrpc.New() for TLS, logging, and auth
- interceptors.go: replaced with MethodMap definition (public, auth-required, admin-required)
- Handler files: switch from auth.ClaimsFromContext to mcdslauth.TokenInfoFromContext
- auth/client.go: add Authenticator() accessor for the underlying mcdsl authenticator
- Tests: use mock MCIAS HTTP server instead of fakeValidator interface
- Vendor: add mcdsl/grpcserver to vendor directory
ListRepositories and GetRepository are now explicitly auth-required
(not admin-required), matching the REST API. Previously they were
implicitly auth-required by not being in the bypass or admin maps.
Security: method map uses default-deny -- unmapped RPCs are rejected.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
