UX-08 phase 2a: short, plain notifications, and a ratchet for the rest

Every HA notification the add-on raises now has a title of at most 5
everyday words and a one-sentence body; a red alarm may use three so no
action is lost. The texts live in app/messages.py, the rule in STYLE.md,
and the detail that moved out in DOCS.md "Notifications", which each body
links to. No notification_id, trigger or cadence changed.

test_messages.py enforces the rule on every notification, fails any
notification worded outside app/messages.py, and ratchets the kinds not yet
rewritten (rows, banners, refusals, logs, options) through a shrinking
allowlist of 200. Six tests re-pinned from prose to meaning.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LyR88rXETvwhTgx6yHE39p

goodwe_controller/app/clamp.py

@@ -362,6 +362,9 @@ class ClampWatchdog:
         self.since: datetime | None = None
         self.last_alarm: datetime | None = None
         self.reason = ""
+        # UX-08: the numbers behind `reason`, for the notification - set under
+        # the same rule as `reason`, so both always describe the same tick.
+        self.facts = ()
         self.clean_cycles = 0
         # SAFETY-41. Consecutive engaged cycles, and whether THIS episode has
         # spoken yet - the two the escalation clause needs.
@@ -386,7 +389,7 @@ class ClampWatchdog:
         return True
 
     def note(self, engaged: bool, reason: str, now: datetime,
-             bug: bool = True) -> bool:
+             bug: bool = True, facts=()) -> bool:
         """Advance one cycle. True when the caller should raise the alarm.
 
         `now` is the caller's clock, the same discipline as
@@ -408,6 +411,7 @@ class ClampWatchdog:
                 self.bug_spoken = False
             if bug or not self.bug:
                 self.reason = reason
+                self.facts = tuple(facts)
             self.bug = self.bug or bug
             if bug and not self.bug_spoken and self._due(self.last_bug_alarm, now):
                 return self._speak(now, True)
@@ -465,6 +469,7 @@ class ClampWatchdog:
             # above. The episode ends; the notification budget does not reset
             # with it.
             self.reason = ""
+            self.facts = ()
             self.bug = False
             self.clean_cycles = 0
         return False