2026-03 Monthly Summary: Delivered a critical reliability improvement to Rails parallel testing by reaping dead workers during shutdown to prevent infinite hangs when workers die unexpectedly. The change extends the previous fix and addresses scenario gaps identified in #57052, using Process.waitpid with WNOHANG inside the Server#shutdown loop to detect dead workers at any point during shutdown. Impact: reduces CI downtime and flaky test runs, enabling faster feedback and more stable release cycles. Technical scope included Ruby process management, non-blocking waits, and integration with Rails parallelization. Commit: eea3e6cbd9607b404df95d03723f932125b1697c. Repository: rails/rails.