Say which subagent ends reach the uncorrelated merge
Commit

Copilot CLI now joins its subagent stop to the launch in the parent transcript and drops the event when that fails, so the empty-ID merge is only a fallback for agents that send no correlation ID at all.
Co-Authored-By: Claude Opus 5.5 (1M context) noreply@anthropic.com Entire-Checkpoint: 01M38P7NDE94KCC1AB1K3QMNKV
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