JSON output, output modules, tests, and CI

[marcopesani]

Summary

• --json mode: Machine-readable stdout (TOON decoded to JSON); status on stderr via output formatters.
• Modules: src/output.ts (human/JSON formatters, parseToonToJson), src/tools.ts (schema coercion and Commander option wiring).
• Tests: Vitest unit tests for output and tools; tests excluded from dist via tsconfig.
• CI: Run pnpm test on every push and before npm publish.

Commits

1. chore: add vitest and test script
2. chore: exclude unit tests from TypeScript dist output
3. feat: add output formatters and TOON/JSON parsing
4. feat: add tool schema helpers for dynamic CLI options
5. refactor: wire CLI to output formatters and tool helpers
6. test: add unit tests for output and tools
7. ci: run unit tests before build and publish

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