{"id":"<id>","timestamp":"<ts>","type":"loop.iteration.completed","data":{"loopId":"append-loop","iteration":0,"durationMs":"<n>","costUsd":"<n>","tokensUsed":"<n>","isFinal":false}}
{"id":"<id>","timestamp":"<ts>","type":"loop.iteration.completed","data":{"loopId":"append-loop","iteration":1,"durationMs":"<n>","costUsd":"<n>","tokensUsed":"<n>","isFinal":true,"terminationReason":"iteration_limit"}}
