Migrate from Poetry to uv

- Convert pyproject.toml to PEP 621 (project table, dependency-groups)
- Switch build backend from poetry-core to hatchling
- Replace poetry.lock with uv.lock
- Update CI to use astral-sh/setup-uv (uv sync / uv build)
- Bump pytest to ^9 and pre-commit to ^4.6
- Remove invalid 'ignore' option from tox.ini [pytest]

Author: timonweb

.github/workflows/ci.yml

@@ -16,19 +16,15 @@ jobs:
         python-version: [ "3.11", "3.12", "3.13", "3.14" ]
 
     steps:
-      - uses: actions/checkout@v2
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+      - uses: actions/checkout@v4
+      - name: Install uv
+        uses: astral-sh/setup-uv@v6
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          python -m pip install poetry
-          poetry install
+        run: uv sync
       - name: Test with pytest
-        run: |
-          poetry run pytest
+        run: uv run pytest
 
   release:
     needs: [ tests ]
@@ -43,17 +39,12 @@ jobs:
     steps:
       - uses: actions/checkout@v5
 
-      - uses: actions/setup-python@v5
+      - name: Install uv
+        uses: astral-sh/setup-uv@v6
         with:
           python-version: '3.11'
 
-      - uses: snok/install-poetry@v1
-        with:
-          virtualenvs-create: true
-          virtualenvs-in-project: true
-          installer-parallel: true
-
       - name: Build
-        run: poetry build
+        run: uv build
 
       - uses: pypa/gh-action-pypi-publish@release/v1