Under the hood
Sub-agent sync error-recovery code was renamed internally with no behavior change found
What
The code that lets a sub-agent's "sync" process recover after an error (handling cutoff notes, harness notes, and updating the background task ledger) was reorganized internally. Messages such as "Sync agent recovering from error with N messages" and the related bookkeeping are unchanged in behavior.
Why
This is internal cleanup only; sub-agent sync recovery works the same as before.