fix: replace O(n²) string concat with array buffering for stdout/stderr#1271

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beran-t wants to merge 3 commits intomainfrom

stdout-memory-leak-fix

Commits on Apr 14, 2026

fix: replace O(n²) string concatenation with array buffering for stdout/stderr
beran-t
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chore: remove memory reproduction script
beran-t
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fix: add cached lazy join for Python async SDK stdout/stderr properties
beran-t
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