Add CI/CD workflows and ESLint configuration

[dortort]

Summary

This PR introduces automated code quality and testing infrastructure by adding GitHub Actions workflows and ESLint configuration to the project.

Key Changes

• GitHub Actions Workflows: Added two new CI/CD workflows
  • lint.yml: Runs ESLint on Node.js 20 for every push to main and pull requests
  • test.yml: Runs build and tests on Node.js 20 and 22 using a matrix strategy
• ESLint Configuration: Added eslint.config.js with recommended rules for JavaScript and TypeScript, ignoring dist/ and examples/ directories
• Dependencies: Added ESLint and TypeScript ESLint packages to devDependencies
• Code Cleanup: Removed unused imports in src/cli/index.ts and src/gen/index.ts to comply with linting rules

Implementation Details

• ESLint is configured using the new flat config format with @eslint/js and typescript-eslint packages
• CI workflows use Node.js 20 as the baseline with Node.js 22 included in the test matrix for forward compatibility
• npm cache is leveraged in both workflows to improve CI performance

https://claude.ai/code/session_01GWGvS1VjSY6rNR2chqbFJv