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* fix(#4120): replace shellcheck npm dep with dependency-free downloader The `shellcheck` devDependency (added in #4109) pulled in decompress@4.2.1 for archive extraction, which carries an unpatched CRITICAL zip-slip vulnerability (GHSA-mp2f-45pm-3cg9, CVSS 9.1) plus two moderate findings. decompress's latest published version IS the vulnerable one -- no patched release exists upstream, so npm audit fix cannot resolve this by upgrading. Removes the shellcheck package entirely and replaces its role with scripts/lib/shellcheck-fetch.cjs: a small downloader using only Node's built-in https/zlib plus a hand-written tar-entry reader, fetching a pinned koalaman/shellcheck release directly from GitHub releases. The reader never uses an archive-supplied name as a filesystem path (the exact defect class decompress had) -- it only returns the matched entry's bytes; the caller writes those bytes to a path it constructs itself. Bounds the download with a 30s-per-hop timeout, consistent with the ShellCheck subprocess's own timeout. Covers linux/darwin on x86_64/aarch64, matching this repo's actual CI (lint-tests runs only on ubuntu-latest) and local dev needs; Windows fails with a clear, honest error rather than silently misbehaving. Adds tests/lint-workflow-shellcheck-fetch.test.cjs covering the tar-parser (unit cases plus a fast-check property test per CLAUDE.md's parser-testing requirement), a security behavioral pin confirming traversal-style entry names are treated as opaque strings never filesystem paths, and boundary coverage for the redirect-following logic's MAX_REDIRECTS limit (limit-1/limit/limit+1, via an injectable transport, no real network I/O). npm audit: 0 vulnerabilities (was 1 critical + 5 moderate). The lint script reproduces the identical result against the current tree: "212 pre-existing finding(s) from baseline, 0 new" -- no behavior regression, no baseline changes needed. * fix(#4120): register shellcheck-fetch.cjs with the installer scripts/lib/shellcheck-fetch.cjs shipped without being added to GSD_SCRIPTS_LIB_FILES in bin/install.js, which would have left it orphaned on uninstall and broken the golden install-tree fixtures for every runtime. Adds the entry and regenerates the 19 affected fixtures via npm run gen:install-tree. * docs(#4120): add changeset for the decompress CVE fix --------- Co-authored-by: sim <sim@local>
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