refactor: reorganize tests/tools, share python protocol helpers

.github/workflows/ci.yml

@@ -30,5 +30,12 @@ jobs:
       - name: Clippy
         run: cargo clippy --workspace --all-targets -- -D warnings
 
+      - name: Smoke-check Python tools
+        run: |
+          python3 -m py_compile tools/*.py
+          for f in tools/test_plot.py tools/test_drone.py tools/test_ansi.py tools/stress_test.py; do
+            python3 "$f" --help >/dev/null
+          done
+
       - name: Run tests
         run: cargo test --workspace