feat(self-update): prefer zstd-compressed download#344
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CI now publishes bestool[.exe].tar.zst alongside the uncompressed binary (zstd shrinks the binary to ~36% of its uncompressed size). self-update probes for the .tar.zst variant first and extracts it via binstalk-downloader's existing Tzstd support. Falls back to the uncompressed URL when .tar.zst isn't present (older versions still on S3). Old clients keep using the uncompressed URL. Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Stacked on #341.
Summary
The bestool binary has grown to ~50 MiB uncompressed and CloudFront doesn't compress on the fly. zstd shrinks it to ~36% of that (around 18 MiB).
bestool[.exe].tar.zstalongside the uncompressed binary and uploads both to the versioned andlatest/S3 paths. The tarball wraps the single binary so we can reuse binstalk-downloader's existingTzstdextractor on the client side without adding a new direct dep.self-updateprobes forbestool[.exe].tar.zst; if present, downloads and extracts viaPkgFmt::Tzstd. Falls back to the uncompressed URL when the.tar.zstisn't there — covers older releases still on S3, and old clients keep hitting the existing path unchanged.