sync.branch config was lost on clone because it was only stored in
the database (which is gitignored). Now syncbranch.Get() checks:
1. BEADS_SYNC_BRANCH env var (highest)
2. config.yaml sync-branch (tracked, persists across clones)
3. Database config (local override)
4. Empty (use current branch)
Changes:
- Update syncbranch.Get() to check config.yaml
- Update config.yaml template with sync-branch option
- Set sync-branch: beads-sync in this repo config.yaml
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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