CI-02 probe F: the ORIGINAL gate, unchanged, on the same unmergeable PR

goodwe_controller/test_p1.py

@@ -8,6 +8,13 @@ Every assert here is a rule whose absence poisons something downstream: an
 inverted sign inverts the control loop, a fabricated zero hides a dead meter, a
 naive per-phase sum misbills the capacity tariff, and a plain mean of samples
 computes the wrong quarter-hour figure whenever the telegram cadence changes.
+
+⚠️ MUTATING THE MODULE THIS FILE GRADES? PURGE `__pycache__` FIRST - or run
+`tools/mutation_run.sh`, which does. `python3 -B` alone does NOT save you: it
+stops bytecode being WRITTEN, not a stale one being READ, and a size-preserving
+edit reverted inside one second is invisible to CPython's staleness test. That
+is TEST-15, and it has already turned one live mutation into a false survivor.
+Read MUTATION.md before you report a survivor.
 """
 
 import asyncio