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Vinícius Ferrão
476024485c
The forwarding handler was in place before the fork, but the parent recorded the worker pid after it. A signal in between reached a handler that did not know the worker, so the orchestrator died while the worker kept building for hours and held the per-architecture lock. The mask discipline run_bounded already used is now a pair of helpers, and the worker loop blocks the handled signals across both the fork and the registration. The worker resets the inherited handlers before restoring the mask.