Implement Continuous Integration (CI) Workflow

[pouria-mirebrahimi]

Story MP-011: Implement Continuous Integration (CI) Workflow

Description:
Automate testing, linting, and formatting checks via CI/CD (GitHub Actions or GitLab CI) to ensure consistency and reliability across commits.

Tasks:

• Add .github/workflows/ci.yml or .gitlab-ci.yml configuration
• Integrate pytest, flake8, and black in CI steps
• Include environment setup and dependency caching
• Ensure CI triggers on every push and pull request
• Add build status badge to README.md

Acceptance Criteria:

• CI pipeline executes successfully on every commit
• Linting and tests run automatically
• Build badge displays current status in README

Estimation: 1.5 days
Dependencies: MP-010
Status: Planned