feat: add GitHub Actions CI workflow

[dashitongzhi]

Summary

This PR adds GitHub Actions CI workflow for automated testing and linting.

Changes Made

• Add CI workflow for project testing and linting

Checklist

• Code follows project style guidelines

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[Copilot]

Pull request overview

This PR adds a GitHub Actions workflow intended to run Python linting, type-checking, and tests on pushes and pull requests.

Changes:

• Added a new GitHub Actions workflow (Python CI) triggered on push (main/master) and pull_request
• Configured a Python version matrix (3.9–3.12) and steps for dependency install, flake8, mypy, and pytest/unittest

Comments suppressed due to low confidence (2)

.github/workflows/python-ci.yml:24

• The dependency install step suppresses errors and always succeeds (2>/dev/null plus || true), which can make CI green even when dependency installation is broken. Prefer failing the job when dependency installation fails, or explicitly skipping the job only when you’ve verified there’s no Python project to install (with a clear message).

      - name: Install dependencies
        run: |
          pip install -e . 2>/dev/null || pip install -r requirements.txt 2>/dev/null || true
          pip install pytest pytest-cov flake8 mypy

.github/workflows/python-ci.yml:33

• Both type checking and tests are structured to pass even when they fail or aren’t configured (|| echo ..., redirects to /dev/null). This defeats the purpose of CI; if mypy/pytest are optional, use explicit conditionals (e.g., only run when config/tests exist) or continue-on-error with a clear rationale, but don’t silently ignore real failures.

      - name: Type check with mypy
        run: |
          mypy . --ignore-missing-imports 2>/dev/null || echo "mypy not configured"
      - name: Run tests
        run: |
          pytest --tb=short --cov=. --cov-report=term-missing 2>/dev/null || python -m unittest discover 2>/dev/null || echo "No test framework found"

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