UX-08 review: tighter notification texts, and two meaning fixes

- not delivering: the body said control keeps running and then "start
  control"; clearing it takes stop then start, and it now says so.
- peak reserve: the "reserve not set" branch is really soc_floor None,
  i.e. an inverter's cut-out level missing; it now names that. The title
  is true on all three branches ("Battery stopped limiting the peak").
- no semicolon run-ons in bodies (STYLE.md + test); loop-bound, circulating,
  meter-frozen and multi-unit over-rating bodies rewritten to match.
- allowlist cap is now exact, so a shrink cannot leave room to regrow.
- DOCS names the settings behind "peak reserve" and "cut-out level";
  DECISIONS no longer states the HA anchor behaviour as fact.

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

goodwe_controller/app/main.py

@@ -3917,7 +3917,7 @@ class Controller:
         await self.hass.call("persistent_notification", "create",
                              messages.peak_reserve(
                                  g.ceiling_w, soc_unread=g.soc is None,
-                                 reserve_unset=(g.soc is not None
+                                 floor_unknown=(g.soc is not None
                                                 and g.soc_floor is None),
                                  packs=(_blocked if len(self.inverters) > 1
                                         else ())).data())