generateMeta abstract method
Generates entity metadata from a private signing key.
Creates cryptographically valid Meta by deriving the public key from the private signing key, with optional seed for reproducibility.
@param type - Metadata type (e.g., "user", "group")
@param sKey - Private signing key to derive the public key from
@param seed - Optional seed value for generating the fingerprint
@return Generated Meta instance
Implementation
Meta generateMeta(String type, SignKey sKey, {String? seed});