Refactor CI workflow to use 'uv' commands

Updated GitHub Actions workflow to use 'uv' for setup and dependency management.

base.yml

@@ -0,0 +1,50 @@
+name: Test
+
+on:
+  push:
+    branches:
+      - master
+      - gh-wf-v3
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]   
+        python-version: ['3.10', '3.11', '3.12', '3.13'] 
+      fail-fast: false
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Set up uv
+      uses: astral-sh/setup-uv@v7
+
+    - name: Install dependencies with uv
+      run: |
+        uv sync
+        uv pip install transformers>=4.0.0
+
+    - name: Add nanochat to PYTHONPATH (Unix)
+      if: runner.os != 'Windows'
+      run: |
+        echo "PYTHONPATH=$(pwd):$PYTHONPATH" >> $GITHUB_ENV
+
+    - name: Add nanochat to PYTHONPATH (Windows)
+      if: runner.os == 'Windows'
+      run: |
+        echo "PYTHONPATH=$PWD;$env:PYTHONPATH" >> $env:GITHUB_ENV
+
+    - name: Run pytest
+      run: |
+        uv run pytest tests/ --maxfail=5