ci: Add GitHub Actions CI/CD workflows for automated testing and linting

[NobleCoder69]

Problem Statement

Currently, there's no automated testing or code quality checks on every pull request. This means:

• Broken code can be merged
• Code quality issues aren't caught automatically
• No consistency enforcement
• Manual review burden is high

Objective

Add GitHub Actions workflows to automatically:

• Run pre-commit hooks (lint, format, type check)
• Run automated tests
• Provide feedback on PRs
• Auto-fix formatting issues

Acceptance Criteria

1. Create .github/workflows/lint.yml with:

   • Run pre-commit hooks on every PR
   • Report failures
   • Suggest fixes

2. Create .github/workflows/tests.yml with:

   • Run pytest on every PR
   • Report test results
   • Check coverage (if tests exist)

3. Create .github/workflows/format.yml with:

   • Auto-fix formatting issues
   • Commit fixes back to PR
   • Comment on PR with changes

4. Document workflows in .github/workflows/README.md

Success Metrics

✅ Pre-commit hooks run automatically on every PR
✅ Test results visible in PR checks
✅ Auto-fixes committed to PR branch
✅ Clear feedback on code quality
✅ No manual intervention needed

Notes

• Workflows run on every push and PR
• Uses pre-commit framework (already configured)
• Uses pytest for tests (if tests added later)
• Auto-fix requires write permissions