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## Why Managed stderr logs previously retained a tail only before a new launch, allowing logs to grow during a long-running process. Direct stderr writes could also block lifecycle operations on disk I/O. ## What changed - Route managed app-server and updater logs through a shared nonblocking worker with a bounded queue. Drop records when the queue is full or a record exceeds 16 KiB, and avoid waiting for the worker at shutdown. - Prune live logs when they exceed 1 MiB, preserving the latest 256 KiB in `.log.previous` before truncating the current file. Keep inherited stderr handles usable after truncation. - Pause predecessor pruning during Windows updater handoff and resume it after a failed handoff only when ownership has been restored. - Keep ordinary stderr output when managed logging has not been initialized. ## Testing Add regression tests for stalled workers and queue overflow, tail retention, inherited append and nonappend handles, and pruning exclusion during updater handoff. GitOrigin-RevId: b6301962b1180fa6cdb231a56edce2429dc20b54