Add Python Semantic Release for automated releases (#27)

* Add Python Semantic Release for automated version management

- Add python-semantic-release dependency via pixi
- Configure PSR in pyproject.toml with version tracking and changelog generation
- Update release workflow to use manual dispatch with patch/minor/major options
- Run full test suite (linting, type checking, unit tests, integration tests) before release
- Use pixi for package management in GitHub Actions
- Implement PSR for automated version bumping and tagging
- Maintain PyPI trusted publishing for secure releases

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Make release workflow DRY by reusing CI workflow

- Add workflow_call trigger to CI workflow for reusability
- Update integration tests to run on workflow_call events
- Release workflow now calls CI workflow instead of duplicating steps
- Simplified release job to only handle semantic release and PyPI publishing
- Maintains all quality checks while reducing code duplication

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: msch-nutrient

.github/workflows/ci.yml

@@ -5,6 +5,7 @@ on:
     branches: [ main, develop ]
   pull_request:
     branches: [ main, develop ]
+  workflow_call:
 
 jobs:
   test:
@@ -57,7 +58,7 @@ jobs:
 
   integration-test:
     runs-on: ubuntu-latest
-    if: github.event_name == 'pull_request'
+    if: github.event_name == 'pull_request' || github.event_name == 'workflow_call'
 
     steps:
     - uses: actions/checkout@v4

.github/workflows/release.yml

@@ -1,31 +1,47 @@
 name: Release
 
 on:
-  release:
-    types: [created]
+  workflow_dispatch:
+    inputs:
+      level:
+        description: 'Version level to bump'
+        required: true
+        default: 'patch'
+        type: choice
+        options:
+          - patch
+          - minor
+          - major
 
 jobs:
-  deploy:
-    runs-on: ubuntu-latest
+  ci:
+    uses: ./.github/workflows/ci.yml
+    secrets: inherit
 
+  release:
+    runs-on: ubuntu-latest
+    needs: ci
+    concurrency: release
+    permissions:
+      id-token: write
+      contents: write
+    
     steps:
     - uses: actions/checkout@v4
-
-    - name: Set up Python
-      uses: actions/setup-python@v5
       with:
-        python-version: '3.12'
+        fetch-depth: 0
+        token: ${{ secrets.GITHUB_TOKEN }}
 
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        pip install -e ".[dev]"
+    - name: Install Pixi
+      uses: prefix-dev/setup-pixi@v0.8.1
+      with:
+        pixi-version: v0.29.0
 
-    - name: Build package
-      run: python -m build
+    - name: Semantic Release
+      run: pixi run python -m semantic_release version --${{ inputs.level }}
+      env:
+        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
     - name: Publish to PyPI
-      env:
-        TWINE_USERNAME: __token__
-        TWINE_PASSWORD: ${{ secrets.PYPI_API_TOKEN }}
-      run: twine upload dist/*
+      uses: pypa/gh-action-pypi-publish@release/v1
+      if: github.ref == 'refs/heads/main'