Skip CI for draft pull requests

[ulises-jeremias]

Feature Request

Skip test/lint/type-check CI workflows when a PR is in draft state, to save resources during work-in-progress.

Current behavior

All CI workflows run on every PR regardless of draft status.

Expected behavior

Workflows for pull_request events should check github.event.pull_request.draft == true and skip execution early, then run normally when the PR is marked ready for review.

Reference

CNA implements draft PR skipping. Parity gap documented in the feature alignment sweep.