go-pkgz / pool / 20559195216

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fix: address pool bugs and improve test coverage

- Close() now always closes channels even on context timeout
- Close() extracted flushAccumulators() for cleaner code structure
- Go() activation check made atomic with CompareAndSwap
- WithBatchSize() handles negative values (treats as 0)
- Wait-time metrics now calculated after processing completes
- Added GetStats() thread-safety documentation

Tests added for: double Go() activation, negative batch size,
Close/Wait context timeout, pre-cancelled context, batch flush
deadlock, worker completion error combination, middleware edge
cases (invalid Retry/Timeout values, Recovery with int panic)

57 of 61 new or added lines in 1 file covered. (93.44%)

614 of 637 relevant lines covered (96.39%)

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