pub(super) fn tool_use_id_for(subagent_jsonl: &Path) -> Option<String>Expand description
The parent-side tool_use_id for a subagent transcript, read from its
sidecar. None when there is no sidecar, it is unreadable, it is malformed,
or it predates the field — all of which must degrade to the old
conservative behaviour rather than erroring.