881e0940a7
- Create internal/configfile package for config.json handling - bd init now creates .beads/config.json with database, version, and jsonl_export fields - Database discovery checks config.json first, falls back to beads.db - Update .gitignore to not ignore config.json (part of repo state) - Update test to expect beads.db and config.json - Backward compatible with existing beads.db-only setups