On Node v24.16.0 / v26.1.0+, `impeccable install` printed "Downloading
impeccable skills...", exited 0, and installed nothing. A Node streams
regression (nodejs/node#63487) made pause()/resume() no-ops on destroyed
streams, stalling extract-zip's yauzl/fd-slicer read stack partway through;
its promise never settled and the process exited clean with no error.
Swap extract-zip for fflate across both extraction call sites
(downloadAndExtractBundle, copyOrExtractLocalBundle) via a new extractZip
helper. fflate decompresses from an in-memory buffer and never touches the
fs stream path, so it is immune on every Node version. It is pure JS with
zero dependencies, so the Windows fix from #198 (no `unzip` binary) holds.
Unlike extract-zip, fflate is actively maintained.
Because extractZip writes entries itself, it guards against zip-slip (`../`
entries escaping the target dir). Tests add a many-file regression guard
(fails on partial extraction) and a zip-slip rejection test.
Verified end-to-end: the real 1,194-file universal bundle extracts and
installs completely.
Fixes#250.
Co-authored-by: Claude <noreply@anthropic.com>
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