feat: session B — auth implementation + signals (26 stubs complete)
Implement ConfigureAuthorization, CheckAuthentication, and full auth dispatch in NatsServer.Auth.cs; add HandleSignals in NatsServer.Signals.cs; extend AuthHandler with GetAuthErrClosedState, ValidateProxies, GetTlsAuthDcs, CheckClientTlsCertSubject, ProcessUserPermissionsTemplate; add ReadOperatorJwt/ValidateTrustedOperators to JwtProcessor; add AuthCallout stub; add auth accessor helpers to ClientConnection; add NATS.NKeys package for NKey signature verification; 12 new tests pass.
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