Prepare the first npm release for Buddy

[owenqwenstarsky]

Summary

• update the package for first-time npm publishing as @teichai/buddy with alpha version 0.0.1
• add release metadata and packaging safeguards, including MIT licensing, Node engine requirements, prepack/prepublishOnly, and a build-only TS config
• make the installed CLI executable by adding the node shebang and standardizing the buddy config command in docs and user-facing messages
• add test execution to CI and refresh the lockfile to pin undici@6.24.1 via overrides to resolve audit findings

Testing

• npm run check
• npm test
• npm audit
• npm publish --dry-run