SAFETY-86: peak guard outranks the maintenance hold

During a HOLD the holding battery gives what keeps the quarter at the peak
aim. N=1: the peak floor is refiled at P_MAINTENANCE, as for a drain
(SAFETY-83). N>=2: the hold's pin is raised to the floor minus what the
other live batteries may place, so they give first. A site stop still
decides alone. The hold ends on its clock even if the level dipped.
Below the aim nothing changes (rows identical).

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

goodwe_controller/test_safety83.py

@@ -295,11 +295,10 @@ def store_hold():
 
 
 _h_rows, _h, _hb = run(6000.0, 2500, 50, 2000, dur=600.0, store=store_hold())
-check("a maintenance HOLD at N=1 is not changed (DECISIONS/SAFETY-83, not "
-      "changed): the battery stays at 0 W with the house over the limit",
+check("a maintenance HOLD at N=1 now gives way to the guard too (SAFETY-86, "
+      "test_safety86.py): the battery gives with the house over the limit",
       _h.maints[0].phase == "hold" and _h.peak_guard.engaged
-      and _h.peak_guard.floor_w > 0.0
-      and all(cmd(r) == 0.0 for r in _h_rows))
+      and cmd(_h_rows[-1]) > 0.0 and "limited by peak" in _h_rows[-1][6])
 
 print()
 if fails: