ci: test workflow

[meirk-brd]

Summary

• Added GitHub Actions workflow for automated testing on push and PRs to main branch
• Created MCP server health test to verify stdio communication
• Added test script to package.json for easy test execution

Changes

New Files

• .github/workflows/test.yml: GitHub Actions workflow that runs tests on Node.js 22 for all pushes and PRs to main
• test/server-health.test.js: Integration test that validates the MCP server can start, communicate over stdio, and respond to tool calls

Modified Files

• package.json: Added test script to run Node.js native test runner