* fix(doctor): add .sync.lock and sync_base.jsonl to gitignore
Problem:
- .sync.lock and sync_base.jsonl were missing from GitignoreTemplate
- Files introduced in PR #918 (pull-first sync) appeared as untracked
Solution:
- Add patterns to GitignoreTemplate with explanatory comment
- Add patterns to requiredPatterns for bd doctor validation
Impact:
- Existing users get warning via bd doctor, fix via bd doctor --fix
- New repos get correct gitignore on bd init
Fixes: GH#974
* docs(sync): fix sync_base.jsonl tracking status and add tests
Problem:
- SYNC.md incorrectly documented sync_base.jsonl as "git-tracked"
- No tests validated sync state file gitignore patterns
Solution:
- Update Files Reference table: sync_base.jsonl is "not tracked, per-machine"
- Add TestGitignoreTemplate_ContainsSyncStateFiles
- Add TestRequiredPatterns_ContainsSyncStatePatterns
Relates to: GH#974
edbfd5dc96