Summary

• Add focused Vitest coverage for the public runtime entrypoint exported from dist/index.ts
• Add focused Vitest coverage for the plugin barrel exported from dist/plugins.ts
• Keep the slice test-only and scoped to public export wiring

/claim #71

Validation

• pnpm exec vitest run src/public-entrypoints.test.ts
• pnpm exec prettier --check src/public-entrypoints.test.ts
• git diff --check

AI-assisted with OpenAI Codex; I reviewed the diff and validation before submitting.