Add missing NoSessionPIDFD error to the interface definition; the error is emitted by vl_method_create_session() when the session leader process does not have a pidfd available, but was never declared in the IDL. Drop SD_JSON_MANDATORY from the ReleaseSession.Id dispatch entry so that omitting the field (which the IDL allows via SD_VARLINK_NULLABLE) resolves to the caller's own session via session_is_self(NULL).
System and Service Manager
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