Add CI pipeline for linting, tests, and type checking

Configure a CI pipeline using GitHub Actions or a similar tool to run type checking, linting, and tests on every push and pull request. Fail the pipeline on style or test regressions.

Look for existing scripts in package.json for linting, testing, and type checking. Check if there are configuration files for TypeScript, ESLint, or a test runner. Create a GitHub Actions workflow file in .github/workflows/ that runs these commands on push and pull request events. The pipeline should fail if any command exits with a non-zero code.

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