Feature Request: Add root-level validation workflow scripts

### Describe the solution you'd like

The repository currently exposes build and release scripts, but lacks centralized validation workflow commands for contributors.

Examples currently missing:
- lint
- typecheck
- unified validation workflow

Additionally, the current root `test` script is still a placeholder:

```json
"test": "echo \"Error: no test specified\" && exit 1"

### Describe alternatives you've considered.

```md id="w12w9m"
Contributors can currently run package-level commands manually, but centralized scripts would provide a more consistent developer workflow.