isInvokable

Returns true when a node in this state may receive a deliberate invocation.

NodeState.PAUSED is documented as suppressing execution — the node exists but its processor is deliberately suspended by user action. NodeState.DELETING means the node is in the middle of removal; firing work into it is semantically wrong and the server will reject it.

All other states (including error and transient execution states such as NodeState.PROCESSING and NodeState.EXECUTED) are considered invokable: the server remains the authoritative gatekeeper, and the SDK should not over-eagerly block invocations that the server might still accept.

Used by krill.zone.shared.node.NodeHttp.invokeNode to short-circuit network calls for clearly non-invokable states.