SAFETY-126: a landing error on the aim is not an overrun

During the night grid charge under the peak reserve the guard alarmed
(ERROR PEAK_GUARD_FLOOR_LIMITED, "Battery stopped limiting the peak") and the
Batteries "Why" said "The peak limit needs power" at quarter ends, while every
quarter landed on the aim. The charge lands the period 0-7 W over the aim and
excess_w()'s 900 / remaining turns that into tens of kW in the last second;
with nothing able to give, check_peak_floor_limited() alarmed on any
wanted > 0.

Each cycle the guard wants power, _peak_landing() asks misses_aim(): with the
batteries at 0 W, does the period end more than ALARM_MISS_W over the aim? If
not, the decision is within_aim: no reserve alarm, no red peak row, no "Why"
peak. The claim and the commands are unchanged. A real overrun under the
reserve alarms on the same cycle as before.

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

goodwe_controller/app/homeview.py

@@ -818,9 +818,11 @@ def refusing(c, inv) -> int:
 def peak_engaged(c) -> bool:
     """The peak guard asks the batteries for power this cycle. Not when it is
     blind or floor-limited: those are engaged with a 0 W floor (no charging
-    only), so no battery gives power for it."""
+    only), so no battery gives power for it. Nor when the quarter ends on
+    the aim anyway (SAFETY-126, `within_aim`)."""
     pg = getattr(c, "peak_guard", None)
-    return bool(pg is not None and pg.engaged and (pg.floor_w or 0.0) > 0.0)
+    return bool(pg is not None and pg.engaged and (pg.floor_w or 0.0) > 0.0
+                and not pg.within_aim)
 
 
 def battery_rows(c, shadow, running, held=False):