Release 0.10.7-bearhub.6

Complete M1 identity work, fix runtime URL regressions, repair the test
suite, add CI, migrate packaging/AppImage branding to Bearhub, and
document the Qt6/PySide6 migration plan.

.github/workflows/tests.yml

@@ -0,0 +1,35 @@
+name: Tests
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  unittest:
+    name: unittest (${{ matrix.python-version }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.11", "3.12"]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+          pip install -e .
+
+      - name: Run unit tests
+        run: python -m unittest discover -s tests -p "test_*.py" -v