SAFETY-90: the peak guard goes on after a P1 meter gap

A meter gap past meter_max_age_s left seconds the quarter average never
counted, so the guard was blind for the rest of the quarter (rig case 7b:
3964.8 W against a 3450 W aim). Once readings are back, the missed seconds
now count at the higher of the limit and the import seen just before and
just after the gap with the batteries at 0 W (peakguard.gap_w/fill_gaps);
the gap's first meter_max_age_s is topped up to that too. Seconds before
the add-on's first reading count at the aim, and the page says part of the
period was not measured (EN/NL). The bill record is unchanged; no option.

DECISIONS/SAFETY-90-peak-guard-after-a-gap.md, test_safety90.py.

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

goodwe_controller/DOCS.md

@@ -1752,10 +1752,16 @@ ceiling at the cap, so a broken instrument makes the guard stricter, never loose
 **When it cannot see, it forbids importing.** Three states are not evidence and
 are checked before the projection is graded: no open quarter (a fresh averager
 projects a confident 0 W, which is under every ceiling there is), a meter gap
-longer than `meter_max_age_s`, and SAFETY-18's frozen-meter conjunction. In all
-three the claim becomes a floor of **0 W**. That is the backstop for the frozen
-meter: the alarm arrives at `meter_freeze_s` (300 s) of a 900 s billing quarter
-and commands nothing, and this stops the import.
+longer than `meter_max_age_s` while it lasts, and SAFETY-18's frozen-meter
+conjunction. In all three the claim becomes a floor of **0 W**. That is the
+backstop for the frozen meter: the alarm arrives at `meter_freeze_s` (300 s) of
+a 900 s billing quarter and commands nothing, and this stops the import.
+
+**After a gap it goes on (SAFETY-90).** The seconds the meter missed count at
+the higher of the peak limit and the import seen just before and just after
+the gap, with the batteries at 0 W. Seconds before the add-on's first reading
+count as on target, and the page says part of the period was not measured.
+DECISIONS/SAFETY-90-peak-guard-after-a-gap.md has the bound.
 
 **It trips, where the freeze detector only notifies,** and the captures are why.
 On the healthy reference day (2026-08-23) it engages on **zero** of 95 quarters.