Add pull request validation to CI workflow

[Copilot]

CI workflow contained only placeholder steps (echo Hello, world!). Added actual validation for Jupyter notebooks and Python dependencies.

Changes

• Python environment: Setup Python 3.11 with pip caching
• Notebook validation: Validate syntax of all .ipynb files using nbconvert
• Dependency verification: Install from requirements.txt and run pip check for compatibility

Implementation Details

Notebook validation handles edge cases:

shopt -s nullglob
notebooks=(notebooks/*.ipynb)
if [ ${#notebooks[@]} -eq 0 ]; then
  echo "No notebooks found to validate"
  exit 0
fi

This ensures the workflow fails if notebooks have syntax errors or dependencies conflict, rather than passing with no validation.

Original prompt

pull

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