Module queue 

Message queue and steering semantics for concurrent message handling (Phase 2.5).

Enables safe preemption at tool boundaries, message queuing during active runs, and priority-based drain ordering: interrupt > steer > followup > collect.

Structs

MessageQueue

Thread-safe message queue with steering semantics.

QueueConfig

Configuration for the message queue.

QueueStatus

Snapshot of the queue state for API responses.

QueuedMessage

A message waiting in the queue.

Enums

QueueError

Errors from queue operations.

SteeringAction

Action to take at a tool boundary based on queue state.

Traits

PreemptionCheck

Trait for checking preemption at tool boundaries.