build(deps-dev): bump root dev deps (alt take on #306) (#351)
Same dev-dep bumps as #306, but pinned to what the project actually
supports:
- @types/node kept on ^24 (Node 24 LTS per .nvmrc / engines), not ^25
- typescript kept on ^5.9 (defer TS 6 major to its own PR)
- husky 9 prepare script updated to the v9 syntax (`husky` vs
deprecated `husky install`)
Co-authored-by: Cursor Agent <agent@cursor.com>
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