fix: relax Node.js engine requirement to support Node 20 (#43)

* fix: relax Node.js engine requirement to support Node 20

Relaxes the Node.js engine requirement from `^22.22.0 || >=24.13.0`
to `^20.0.0 || >=22.0.0`.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix: restore platform-specific dependencies in lockfile

The lockfile was regenerated on macOS which excluded Linux/Windows
optional dependencies needed for CI. Regenerated to include all
platform-specific binaries for biome, esbuild, and rollup.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: frankieyan