fix(security): bump js-yaml to 4.3.1 for CVE-2026-59870 - #299
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The daily security audit (issue #289) flagged the one high advisory open on main: quadratic CPU consumption in js-yaml's !!omap resolution, vulnerable range >=4.0.0 <4.3.1. The existing override said ^4.3.0 but the lock pinned 4.3.0 exactly. Raised the override floor to ^4.3.1 and refreshed the lock. Verified the RESOLVED tree, not just the declaration: the lockfile now holds a single deduped js-yaml@4.3.1 (all four transitive parents plus the gray-matter engine in src/lib/blog.ts resolve to it), and install-time audit reports 0 vulnerabilities. 441 tests green. Issue #289 closes itself on the next scheduled audit once this lands. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Closes the one high advisory the daily security audit filed as #289: quadratic CPU in js-yaml
!!omapresolution, vulnerable>=4.0.0 <4.3.1.^4.3.0→^4.3.1, lock refreshed.js-yaml@4.3.1— no nested vulnerable copy behind a patched hoisted one.#289 closes itself on the next scheduled audit after this merges.
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