feat(lexer): add opt-in extended export detection - #128

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: docker/setup-buildx-action@c47758b77c9736f4b2ef4073d4d51994fabfe349. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/