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SetupChainAsync now sequences only non-terminal children (Idle/Queued). Done/Failed/Cancelled rows are left in place so a re-run on a partially executed chain keeps history intact and only reshapes the tail. Running children abort the op since the chain cannot be reshaped mid-flight. First non-terminal child is explicitly unblocked. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>