## Summary
- `claude-code-action` overwrites origin's fetch URL to point to the
base repo (`dyad-sh/dyad`), causing the rebase workflow to push to
upstream instead of the fork
- Added a `Configure push remote for fork PRs` step (matching
`pr-review-responder.yml`) that sets `pushurl` on origin to point to the
fork repo
- Added a learning to `rules/git-workflow.md` documenting this
`claude-code-action` behavior

## Test plan
- Apply `cc:rebase` label to a fork PR and verify the rebase pushes to
the fork, not the base repo

#skip-bugbot

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Ensure claude-rebase pushes to the contributor’s fork instead of the
base repo by setting a push-only remote for fork PRs. Also documents
this claude-code-action behavior in git workflow rules.

- **Bug Fixes**
- Add a “Configure push remote for fork PRs” step to claude-rebase.yml
that sets origin’s pushurl to the PR head repo using GITHUB_TOKEN, so
pushes go to the fork even if claude-code-action rewrites origin’s fetch
URL; matches pr-review-responder.yml.

<sup>Written for commit dbd6a1082657c8a162b137682e1f3c30df697e94.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>