fix(dashboard): keep numbers out of the morning push line

The digest line is the body of the morning push and lands on a locked
phone. It took the briefing's first sentence, the top signal's headline
or the deterministic signal sentence verbatim, so a resting heart rate or
a blood pressure average could sit on the lock screen, and its score
floor stated the score.

A candidate with a figure in it is now passed over for the next, and the
floor says the score is ready instead of what it is. The hero's lead in
the app keeps its numbers. Tests that pinned the numeric line are turned
around, and the push builder is checked on a digest whose lead carries a
reading.

docs/api/openapi.yaml

@@ -72588,7 +72588,8 @@ components:
             since v1.40."
         line:
           type: string
-          description: "Push / lock-screen line: cached-AI lead with a deterministic floor."
+          description: "Push / lock-screen line: cached-AI lead with a deterministic floor. Carries no number (no reading, dose or
+            score), since it is shown on a locked phone; the in-app `lead` keeps its figures."
         worthALook:
           type: array
           items: