chore(setup): add ci/cd pipeline and pre-commit hooks

[CLIAnnie]

Summary

Set up complete CI/CD infrastructure with pre-commit hooks and GitHub Actions workflow to ensure code quality on every commit and pull request.

Changes

• Add .pre-commit-config.yaml with comprehensive quality checks:

  • ruff format (code formatting)
  • ruff lint (code quality checks)
  • basedpyright (type checking)
  • pytest (test suite)
  • General file checks (detect secrets, trailing whitespace, EOF fixes, etc.)

• Add .github/workflows/ci.yml GitHub Actions workflow:

  • Four parallel jobs: test, lint, format, type-check
  • Uses Python 3.11 and uv for dependency management
  • Coverage reporting with codecov
  • Clear job status aggregation

• Update pyproject.toml:

  • Add pytest configuration with testpaths, markers, and strict mode
  • Add coverage configuration with source paths and exclusion rules

• Update CONTRIBUTING.md:

  • Add pre-commit installation instructions
  • Document what each hook does
  • Add CI pipeline documentation
  • Explain how to run checks locally

Test Plan

• Pre-commit hooks configuration is valid YAML
• GitHub Actions workflow is valid YAML
• pyproject.toml is valid TOML
• All documentation is clear and accurate
• CI will run automatically on this PR to validate the workflow

Benefits

• Catch issues before they reach CI (faster feedback loop)
• Consistent code quality enforcement
• Automated testing on every commit
• Clear error messages when checks fail
• Parallel CI jobs for faster builds

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