chore: Update Beads issue tracker and ignore malformed DB files

- Export latest issue state to beads.jsonl
- Add gitignore entries for malformed SQLite DB files created by old buggy code
- Ignore bd-original backup

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -67,3 +67,5 @@ npm-package/bin/LICENSE
 npm-package/bin/README.md
 npm-package/node_modules/
 npm-package/package-lock.json
+.beads/beads.db?*
+bd-original