ci: add source-platform smoke for macOS and Linux

Adds .github/workflows/source-platform-smoke.yml running the existing
unittest suite on ubuntu-latest and macos-latest with QT_QPA_PLATFORM=offscreen.
The git-diff parsing in get_modified_lines() is platform-neutral; the known
flaky test is Windows-specific (CRLF drift) and should pass clean on Linux/macOS.
Also excludes docs/superpowers/ from .gitignore.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Lukas Geiger

.github/workflows/source-platform-smoke.yml

@@ -0,0 +1,45 @@
+name: PythonBox source-platform smoke
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+  workflow_dispatch:
+
+jobs:
+  smoke:
+    name: Smoke (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+
+    env:
+      QT_QPA_PLATFORM: offscreen
+      PYTHONIOENCODING: utf-8
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - name: Install system Qt libs (Linux only)
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update -qq
+          sudo apt-get install -y --no-install-recommends \
+            libgl1 libegl1 libglib2.0-0 libdbus-1-3 \
+            libxkbcommon-x11-0 libxcb-icccm4 libxcb-image0 \
+            libxcb-keysyms1 libxcb-randr0 libxcb-render-util0 \
+            libxcb-xinerama0 libxcb-xfixes0
+
+      - name: Install PySide6
+        run: pip install "PySide6>=6.5.0"
+
+      - name: Run test suite
+        run: python -m unittest discover -s tests -v

.gitignore

@@ -1,4 +1,4 @@
-# Python
+# Python
 __pycache__/
 *.py[cod]
 *$py.class
@@ -54,6 +54,7 @@ releases/
 *.msix
 *.appx
 *.spec
+!PythonBox.spec
 
 # Internal project management
 AUFGABEN.txt
@@ -101,3 +102,9 @@ ehthumbs.db
 
 # Local agent config
 .claude/
+docs/superpowers/
+# ---- Interne Steuerungsdateien ----
+DECISIONS.md
+PORTIERUNGSPLAN.md
+TODO.md
+DONE.md