chore: sync package-lock.json with package.json

CI's `npm ci` was failing with "Missing from lock file" for
@emnapi/core@1.10.0, @emnapi/runtime@1.10.0, @types/node@25.9.1,
and chokidar@4.0.3. Regenerated the lockfile under Node 20
(matching CI's setup-node@v5 with node-version: 20) so the
required transitive entries are present.

Verified locally with `npm ci --dry-run` under Node 20.