Under the hood
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Waiting for a spawned subagent to register now uses a separate, configurable timeout after it first appears.
What
When Claude Code spawns a subagent (a separate Claude instance handling part of a task) and waits for it to show up in the internal registry, the wait logic now takes a settleWaitMs parameter with a default value. The longer default timeout applies only until the subagent is first seen in the registry; after that, the shorter or longer settleWaitMs value governs how long it waits for the subagent to finish settling.
Why
This lets the initial "has it even started" wait and the "is it now done" wait be tuned separately, which should make subagent startup detection more reliable without forcing every wait to use the same timeout.