* fix: auto-detect default branch for worktree creation when baseRef not configured
When creating git worktrees, if no explicit baseRef is configured in
the project workspace strategy and no repoRef is set, the system now
auto-detects the repository's default branch instead of blindly
falling back to "HEAD".
Detection strategy:
1. Check refs/remotes/origin/HEAD (set by git clone / remote set-head)
2. Fall back to probing refs/remotes/origin/main, then origin/master
3. Final fallback: HEAD (preserves existing behavior)
This prevents failures like "fatal: invalid reference: main" when a
project's workspace strategy has no baseRef and the repo uses a
non-standard default branch name.
Co-Authored-By: Paperclip <noreply@paperclip.ing>
* fix: address Greptile review - fix misleading comment and add symbolic-ref test
- Corrected comment to clarify that the existing test exercises the
heuristic fallback path (not symbolic-ref)
- Added new test case that explicitly sets refs/remotes/origin/HEAD
via `git remote set-head` to exercise the symbolic-ref code path
Co-Authored-By: Paperclip <noreply@paperclip.ing>
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Co-authored-by: Paperclip <noreply@paperclip.ing>
