perf: replace subprocess zstd with in-process klauspost/compress#217

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joshfriend wants to merge 2 commits intomainfrom

jfriend/in-process-zstd

Commits on Mar 23, 2026

perf: replace subprocess zstd with in-process klauspost/compress
joshfriend
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fix: close tar stdout pipe after copy to prevent hang on encoder failure
joshfriend
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