Module child_completion 

Child-session completion notification primitives.

The engine owns child runner lifecycle, but parent resume policy lives in the server/application layer. This module defines the small callback boundary between them so child completion is event-driven without making the engine depend on AppState.

Structs

ChildCompletion

Terminal child-session completion recorded by the child runner lifecycle.

ChildCompletionMessageSource

ChildCompletionSource

A seal stored by the final runtime writer in the existing Session commit. It is not a second outcome store: later input/output makes it unavailable.

Traits

ChildCompletionHandler

Application-layer callback invoked when a child session reaches a terminal state. Implementations must be idempotent: duplicate completion events for the same child can occur when watchdog timeout races normal runner teardown.