Module auth 

JWT and shared-secret authentication for the Agent Protocol.

AuthConfig supports four modes:

• Jwt – HMAC-SHA256 JWT validation/issuance.
• SharedSecret – simple string comparison (legacy).
• Dual – try JWT first, fall back to shared secret.
• External – trust an outer layer (e.g. tonic interceptor) that already validated the token; pass through the token value as agent id.

Structs

DkodClaims

JWT claims carried inside every agent token.

Enums

AuthConfig

Authentication configuration supporting JWT, shared-secret, or both.