ci: add GitHub Actions workflows -- fast tests on push/PR, slow suite weekly

.github/workflows/ci.yml

@@ -0,0 +1,31 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
+
+    steps:
+      - uses: actions/checkout@v7
+
+      - uses: actions/setup-python@v7
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install package
+        run: pip install -e ".[dev]"
+
+      - name: Run fast tests
+        env:
+          MPLBACKEND: Agg
+        run: pytest

.github/workflows/weekly-notebooks.yml

@@ -0,0 +1,39 @@
+name: Weekly notebook/example suite
+
+# Runs the slow suite (every chapter notebook + RVC3/examples script) on a
+# schedule rather than on every push/PR -- real matplotlib rendering across
+# 16+ notebooks is too slow to gate normal development on. Timed to finish
+# well before the Saturday-morning (Brisbane) ecosystem scan routines, which
+# run at 22:45 and 23:00 UTC Friday -- see the tracking issue those post to.
+on:
+  schedule:
+    - cron: '13 19 * * 5'   # 19:13 UTC Friday = 05:13 Brisbane Saturday
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+
+    steps:
+      - uses: actions/checkout@v7
+
+      - uses: actions/setup-python@v7
+        with:
+          python-version: "3.12"
+
+      - name: Install package
+        run: pip install -e ".[dev]"
+
+      - name: Run full suite (notebooks + examples)
+        env:
+          MPLBACKEND: Agg
+        run: pytest --runall
+
+      - name: Upload notebook test report
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: notebook-test-report
+          path: tests/reports/latest.md
+          if-no-files-found: ignore