Struct TaskHandle 

pub struct TaskHandle { /* private fields */ }

Coordination state for one task. Embedded inside TaskNode.

Every node is single-instance, so each field is a per-node atomic flag or a single-consumer signal — no counts, no fan-out. Written by one side (task or supervisor) and read by the other:

• shutdown / shutdown_wake — supervisor requests exit; the task parks on the signal and reads the flag.
• dropped / dropped_wake — the task acks its exit; the supervisor parks on the signal (with a timeout) and reads the flag.
• resume_wake — supervisor resumes a parked Pause-mode task.
• running — supervisor’s record that the node is spawned; busy — the task’s active/idle status. Both read by the elastic scaling policy.
• disabled — the node has been manually deactivated; see below.