The github-release job downloaded artifacts but never checked out the repo,
so the new "Extract release notes from CHANGELOG" step threw ENOENT and failed
the whole job — v0.47.0 published 0 binaries despite every bun build succeeding.
Sparse-checkout CHANGELOG.md and harden the notes script to fall back to a plain
release body instead of crashing the publish.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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