## Summary
- Migrates twenty-companion from standalone npm to the repo yarn
workspaces
- Removes package-lock.json (resolves Oneleet security finding about npm
lifecycle scripts)
- Converts npm overrides to yarn resolutions
- Updates scripts from npm run to yarn
## Test plan
- [x] Verified yarn install succeeds at root
- [x] Verified yarn start in twenty-companion launches the Electron app
- [ ] Verify Oneleet finding is resolved after merge
