The pre-push hook now detects when an `upstream` remote is configured
and allows feature branches for the fork contribution workflow.
Previously, the hook blocked all non-main branches, which prevented
pushing PR branches to forks. Now the blocking logic checks for an
upstream remote - if present, it skips the block and allows the push.
The check wraps the blocking logic (rather than early-out) so that
any future additions to the hook will still apply to contributor
workflows.
Fixes#848
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
7016b33b39