SAFETY-87: peak guard uses every battery that can still give

At N>=2 a battery at or under its own peak reserve is held: it gives
nothing for the peak (weight 0 while the site gives) and the guard's need
is placed on the live, non-refusing batteries above theirs. The guard is
floor-limited, and alarms, only when those cannot hold the limit at full
power for ALARM_HOLD_S. The peak alarms no longer read "Not ready" or hold
the Home page at 0 W, because control keeps running. N=1 is byte-identical.

DECISIONS/SAFETY-87-guard-uses-able-batteries.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019DBUfvndgHwaV339Fvd2gr

goodwe_controller/app/homeview.py

@@ -923,24 +923,25 @@ def state_of(c, level, shadow):
 
 
 def build(c, *, level: str, checks: list, now: datetime | None = None,
-          lang: str = "en") -> dict:
+          lang: str = "en", held: bool | None = None) -> dict:
     """The structured half of `/status`, in `lang` (UX-13 P5). Pure reads of
     the controller."""
     _LANG[0] = uitext.lang_of(lang)
     try:
-        return _build(c, level=level, checks=checks, now=now)
+        return _build(c, level=level, checks=checks, now=now, held=held)
     finally:
         _LANG[0] = "en"
 
 
-def _build(c, *, level, checks, now):
+def _build(c, *, level, checks, now, held=None):
     now = now or datetime.now(timezone.utc)
     shadow = bool(c.shadow)
     kind = state_of(c, level, shadow)
     # A red banner means every inverter is at 0 W (the status cascade), so
     # nothing is planned until it clears. Shadow mode still plans: it is
-    # what the add-on would do.
-    held = level == "bad" and not shadow
+    # what the add-on would do. `held` False: an alarm while control runs
+    # (SAFETY-87, the peak alarms).
+    held = level == "bad" and not shadow and held is not False
     running = (bool(c.auto) or shadow) and not held
     settled = all(at_zero(inv) for inv in c.inverters)
     ctl = next((r for r in checks if r.get("id") == "controller"), None)