MAINT-21 review: two source scans read the split files too

test_safety118's "size rule is gone" and test_validate's "no numeric
maintenance_* fallback" read app/main.py only; the code they guard can now
sit in app/ctl_*.py, where a regression passed unseen. Both read
main_files.source() for main.py now. Tests only; no app change.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

goodwe_controller/test_validate.py

@@ -1028,6 +1028,11 @@ check("...and the drain SET is not clamped either, so the twin key the card "
 _srcs = {name: open(os.path.join(os.path.dirname(os.path.abspath(__file__)),
                                  "app", name), encoding="utf-8").read()
          for name in ("main.py", "validate.py", "maintenance.py")}
+# MAINT-21: main.py stands for itself and the files split from it.
+sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)),
+                                "tools"))
+import main_files                            # noqa: E402
+_srcs["main.py"] = main_files.source()
 _literals = {name: re.findall(
     r'"(maintenance_[a-z_]+)"\s*,\s*(-?\d+(?:\.\d+)?)\s*[,)]', src)
     for name, src in _srcs.items()}