Modernize packaging, drop strict pins, add tests and CI

.github/workflows/release.yml

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+name: release
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  build:
+    name: Build sdist and wheel
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install build
+        run: python -m pip install --upgrade build
+
+      - name: Build distribution
+        run: python -m build
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: dist
+          path: dist/
+
+  publish-testpypi:
+    name: Publish to TestPyPI
+    needs: build
+    if: contains(github.ref, '-rc') || contains(github.ref, '-a') || contains(github.ref, '-b')
+    runs-on: ubuntu-latest
+    environment:
+      name: testpypi
+      url: https://test.pypi.org/p/baycomp_plotting
+    permissions:
+      id-token: write
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: dist
+          path: dist/
+
+      - uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          repository-url: https://test.pypi.org/legacy/
+
+  publish-pypi:
+    name: Publish to PyPI
+    needs: build
+    # Only stable tags (no -rc, -a, -b suffix) go to real PyPI.
+    if: ${{ !contains(github.ref, '-') }}
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/p/baycomp_plotting
+    permissions:
+      id-token: write
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: dist
+          path: dist/
+
+      - uses: pypa/gh-action-pypi-publish@release/v1

.github/workflows/test.yml

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+name: tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    # Weekly run on Mondays catches breakage from new transitive deps.
+    - cron: "0 6 * * 1"
+
+jobs:
+  test:
+    name: py${{ matrix.python-version }} on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        include:
+          - os: macos-latest
+            python-version: "3.12"
+          - os: windows-latest
+            python-version: "3.12"
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install package with test extras
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install -e ".[test]"
+
+      - name: Run tests
+        run: pytest --mpl

pyproject.toml

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+[build-system]
+requires = ["hatchling>=1.24"]
+build-backend = "hatchling.build"
+
+[project]
+name = "baycomp_plotting"
+version = "1.2.0"
+description = "Extra plotting functionality for baycomp's Bayesian classifier comparison posteriors."
+readme = "README.md"
+license = { file = "LICENSE" }
+requires-python = ">=3.9"
+authors = [
+    { name = "Mario Juez-Gil", email = "mariojg@ubu.es" },
+]
+keywords = [
+    "bayesian",
+    "classifier-comparison",
+    "machine-learning",
+    "plotting",
+    "baycomp",
+]
+classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Intended Audience :: Science/Research",
+    "Topic :: Scientific/Engineering",
+    "Topic :: Scientific/Engineering :: Visualization",
+    "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+]
+dependencies = [
+    "matplotlib>=3.5",
+    "numpy>=1.21",
+    "scipy>=1.7",
+]
+
+[project.optional-dependencies]
+test = [
+    "pytest>=7",
+    "pytest-mpl>=0.17",
+    "baycomp>=1.0.3",
+]
+
+[project.urls]
+Homepage = "https://github.com/mjuez/baycomp_plotting"
+Repository = "https://github.com/mjuez/baycomp_plotting"
+Issues = "https://github.com/mjuez/baycomp_plotting/issues"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/baycomp_plotting"]
+
+[tool.hatch.build.targets.sdist]
+include = [
+    "src",
+    "tests",
+    "README.md",
+    "LICENSE",
+    "pyproject.toml",
+]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+addopts = "-ra"
+filterwarnings = [
+    "error::DeprecationWarning",
+    "error::FutureWarning",
+    # Emitted by matplotlib's internal use of pyparsing; third-party.
+    "ignore::pyparsing.warnings.PyparsingDeprecationWarning",
+]

src/baycomp_plotting/__init__.py

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+from importlib.metadata import PackageNotFoundError as _PackageNotFoundError
+from importlib.metadata import version as _version
+
+from .plotting import Color, dens, tern
+
+try:
+    __version__ = _version("baycomp_plotting")
+except _PackageNotFoundError:
+    __version__ = "0.0.0+unknown"
+
+__all__ = ["Color", "dens", "tern", "__version__"]