set shutdown flag before cleanup to prevent coordination race - #66
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Controller sets shutdown_requested=True as the first step in delete_breeder. Workers see the flag and stop heartbeating before cleanup runs. Removes need for double-clean retry hack. Co-authored-by: cherusk <10729954+cherusk@users.noreply.github.com>
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Controller sets shutdown_requested first, before any cleanup. Workers stop heartbeating, then cleanup runs cleanly.