- Introduced `resolveArmLaunch` to inherit dataset, task samples, and configurations from existing experiment arms for consistent comparisons.
- Added a POST `/api/experiments/:id/arms` endpoint to programmatically launch new arms within an experiment.
- Created `scripts/dev.ts` and `vite.config.ts` to provide a unified development environment with React Fast Refresh and API proxying.
- Integrated an "Add Arm" UI component in the dashboard to allow user-driven experimental variants.
- Configured Vite to proxy requests to the Bun API server, improving iteration speed during dashboard development.
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