MAINT: add GitHub Actions CI workflow and changelog stub

.github/workflows/test.yml

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+name: test
+
+on: [push, pull_request]
+
+# Note: Full integration tests require a live dserver instance with signed URL
+# support. This workflow runs linting and import checks only.
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -e .
+    - name: Lint
+      run: |
+        pip install flake8
+        flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+    - name: Import check
+      run: python -c "import dtool_dserver; print('import ok:', dtool_dserver.__file__)"

CHANGELOG.rst

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+Changelog
+=========
+
+0.1.0 (initial release)
+-----------------------
+
+* Initial release.
+