Previously push-triggered CI ran only on main, so same-repo branches
got no CI until a PR was opened (fork contributions were and remain
covered by pull_request, which fires on open and on every subsequent
push). Run on all pushes, and add a per-ref concurrency group so rapid
amend-pushes cancel superseded runs. Same-repo branches with an open
PR will run under both events; acceptable at this repo's scale.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AViME1R9ES2UXT1uQDx1TG
3b9d38fbac