SAFETY-136: a gentler loop on a slow meter until the last move shows

On a meter whose readings come 4 s or more apart, the loop runs at half its
gain after a move of 150 W or more, until the meter has fallen by half of the
move or 2 cycles have passed. With readings 10 s late on a 5 s meter the export
falls 44 % over oven, kettle and hob, owner shape, steps; 1-2 s meters are
untouched.

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

goodwe_controller/app/ctl_inputs.py

@@ -197,6 +197,7 @@ class InputsMixin:
             # correlates 0.998 with battery power and 0.09 with the real meter
             # (a controller would regulate against its own output).
             self.grid = self.p1.net_w
+            self.settle.arrive(now_mono, self.p1.samples)   # SAFETY-136
         else:
             self.grid = await self.hass.number(o.get("meter_entity", ""),
                                                bool(o.get("meter_invert")))