Variable ExpectedTerminationReasonsConst

Reasons that indicate expected/managed terminations initiated by BatchCluster (as opposed to unexpected exits like crashes, errors, or timeouts).

These correspond to proactive process lifecycle management:

• "ending": Cluster is shutting down
• "ended": Process already shut down
• "idle": Process was idle too long (maxIdleMsPerProcess)
• "old": Process ran too long (maxProcAgeMillis)
• "worn": Process handled too many tasks (maxTasksPerProcess)
• "tooMany": maxProcs was reduced