Add CI/CD workflow

[Copilot]

Adds GitHub Actions CI pipeline for automated linting and import verification.

Changes

• Lint job: flake8 for syntax errors (E9,F63,F7,F82) and style warnings (max-line-length=120)
• Test job: Matrix build across Python 3.9/3.10/3.11
  • Pip dependency caching via actions/cache@v4
  • Core module import verification (ModelFactory, Trainer, dataloaders, metrics)
• Security: Explicit contents: read permissions

Triggers

• Push to main/master
• Pull requests targeting main/master

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[Copilot]

Pull request overview

This PR adds a GitHub Actions CI/CD pipeline to automate code quality checks and basic import verification for the project.

Changes:

• Adds lint job using flake8 to check for syntax errors and enforce style guidelines (max line length 120)
• Adds test job with Python 3.9/3.10/3.11 matrix that verifies core module imports (ModelFactory, Trainer, dataloaders, metrics)
• Implements pip dependency caching and sets explicit security permissions

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