Adds an optional [string] -Prefix parameter that prepends the supplied
string to every emitted variable name, regardless of -Format
(Json/Yaml/Xml/Env/EnvironmentVariables). When omitted or empty the
exporter buffer is forwarded unchanged (no-op).
Implementation clones each InfisicalSecret with SecretName = Prefix +
SecretName so the caller's pipeline objects are never mutated; the
SecureString and Tags/SecretMetadata array references are shared
(read-only usage downstream).
Also updates the cmdlet help XML description + adds a -Prefix example,
and reflects the new parameter in docs/DesignSpec.md.
GraceSolutions
318db70480