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* fix: prevent stack overflow in ECBalanceTask.reportProgress Add re-entry guard to reportProgress() to prevent infinite recursion. The progressCallback invoked by ReportProgressWithStage can re-enter reportProgress, causing a stack overflow that crashes the worker process (goroutine stack exceeds 1GB limit after ~22M frames). * fix: use atomics for progress and re-entry guard to avoid data races Address review feedback: GetProgress() can be called from a different goroutine while reportProgress is updating the value. Use atomic operations for both the progress field (via Float64bits/Float64frombits) and the reporting re-entry guard (via CompareAndSwap).