Module lifecycle 

Concurrency key lifecycle policy for run execution boundaries.

This module implements the concurrency key acquire and release policy:

• Keys are acquired when a run transitions to Running state (execution starts).
• Keys are released when a run transitions to a terminal state.

The lifecycle logic uses the key gate contracts from key_gate module and does not add unrelated policy behavior.

Structs

KeyLifecycleContext

Context for evaluating concurrency key lifecycle during a state transition.

Enums

LifecycleResult

Result of a key lifecycle operation.

Functions

acquire_key

Attempts to acquire the concurrency key for a run.

evaluate_state_transition

Determines the appropriate key lifecycle action based on a state transition.

release_key

Attempts to release the concurrency key for a run.