SAFETY-129: find readings 30 s late within about 90 s at a 5 s meter

The meter's delay fit needed 16 new values in 60 s, so at the owner's 5 s P1
only the batteries' fit ran and 30 s late was found after about 3 minutes
(export to -420 W). A meter that slow is now also fitted over 120 s; it calls
a delay late only over 16 s, on two fits in a row, with the same corroboration
as before, and never ends a verdict, so a slow battery (R2-1) runs as before.
Found about 90 s after the start, export above -200 W. 10 s late at a 5 s
meter is not found (nothing swings; it cannot be told from a 10 s battery).

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

goodwe_controller/DECISIONS/SAFETY-128-late-readings.md

@@ -31,7 +31,11 @@ inverter limit in its last seconds (OPT-34 rig F-2).
    - **Meter** (`MeterFit`, round 1's fit): `meter(t) + request(t - d)` is the
      house alone at the right `d`. Quick, but confounded by the house. Needs
      16 new values in 60 s, so only a meter of about 3.5 s or faster: at 5 s
-     it gave false delays. Late over 8 s.
+     it gave false delays. Late over 8 s. At a slower meter (a 5 s P1) the
+     same fit runs over 120 s and calls only a delay over 16 s late, on 2 fits
+     in a row, and never ends a verdict (SAFETY-129): a 10-12 s slow battery
+     reads up to 15 s there, so 10 s late is not told from it, and it does not
+     swing at 5 s.
    - A meter fit says late only with evidence from the batteries' side too:
      a request more than 100 W from the battery reading took 3 s or more to
      move a reading towards it (`SLOW_START_S`; on time they start within
@@ -64,9 +68,10 @@ house at 1, 2 and 5 s ticks, so the commands are the same as without the gate.
 The fits run all the time; the pull request has the counts.
 
 **What it costs.**
-- Found 36-68 s after a lag starts at 1-2 s meters, about 3 minutes at a 5 s
-  meter (battery fit only; the meter fit needs a faster meter). Until then control is as before. At 5 s and 30 s
-  late the export is cut to about a third, not removed.
+- Found 36-68 s after a lag starts at 1-2 s meters; at a 5 s meter 30 s late
+  is found about 90 s after it starts (the loop first moves 100 W after 60 s,
+  SAFETY-129) with the export above -200 W, and 10 s late is not found. Until
+  then control is as before.
 - A battery that answers slowly is read as late readings and held: a dead
   time of 10 s or more (8 s reads 7-8; 10 s reads 10 at 1-2 s meters, 9 at
   5 s), or a 15-20 s lag (review round 2). The GoodWe measured settles in 6 s