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## Problem L0 compaction can get starved by other background tasks. It needs to be responsive to avoid read amp blowing up during heavy write workloads. Touches #10694. ## Summary of changes Add a separate semaphore for compaction, configurable via `use_compaction_semaphore` (disabled by default). This is primarily for testing in staging; it needs further work (in particular to split image/L0 compaction jobs) before it can be enabled.