CI-15 throwaway: a deliberately failing test file (do not merge)

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

goodwe_controller/test_ci15_failproof.py

@@ -0,0 +1,8 @@
+"""CI-15 throwaway: a test that fails on purpose, to show a red file fails the job.
+Never merge this branch."""
+import sys
+
+for i in range(1, 51):
+    print(f"line {i} of 50 (only the last 40 should reach the log)")
+print("FAILED: deliberate CI-15 failure")
+sys.exit(1)