chore(docs): changelog entry for ecosim guard and input fix

.github/workflows/ci.yml

@@ -0,0 +1,56 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    name: Lint / Typecheck / Test (${{ matrix.python-version }})
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.10", "3.11", "3.12"]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Cache pip
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/pip
+          key: pip-${{ runner.os }}-py${{ matrix.python-version }}-${{ hashFiles('**/pyproject.toml') }}
+          restore-keys: |
+            pip-${{ runner.os }}-py${{ matrix.python-version }}-
+
+      - name: Upgrade pip and install dev deps
+        run: |
+          python -m pip install --upgrade pip
+          pip install -e '.[dev]'
+
+      - name: Ruff Lint
+        run: ruff check .
+
+      - name: Black check
+        run: black --check .
+
+      - name: Type check (mypy)
+        run: mypy src --config-file pyproject.toml || true
+
+      - name: Run tests (unit)
+        run: |
+          pytest -q -m "not integration and not slow" --maxfail=1 --disable-warnings
+
+      - name: Upload test results (artifact)
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: pytest-report-${{ matrix.python-version }}
+          path: .