The previous implementation used the PR's original branch name when
fetching, which could conflict with existing local or remote branches
of the same name. This caused checkout failures for PRs with common
branch names like 'main' or 'feature/xyz'.
Changes:
- Use 'pr-{number}' format for local branch names (e.g., pr-385)
- Preserve original branch name for logging purposes
- Add detailed logging showing original -> local branch mapping
This ensures uniqueness since PR numbers are unique per repository,
while maintaining support for both same-repo and fork PRs via
GitHub's pull/{number}/head refs.
Fixes the issue introduced in #851 where fork PR support was added.
Co-authored-by: Yi-Cheng Wang <yicheng.wang@heph-ai.com>
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
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