docs(6206): retrieval_tuning model docstring drops the decision quote

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

src/scribe/models/retrieval_tuning.py

@@ -11,10 +11,9 @@ class RetrievalTuningEvent(Base):
 
     WHY A TABLE AND NOT JUST THE SETTING
 
-    The setting holds the number. It cannot hold the argument, and from this
-    step onward the argument is the interesting part: the operator's decision is
-    that the model moves these values, *"9 times out of 10"*, without being
-    asked each time. Delegation like that is only safe if it leaves a trail the
+    The setting holds the number. It cannot hold the argument, and the argument
+    is the interesting part: the model moves these values most of the time,
+    without being asked each time. Delegation like that is only safe if it leaves a trail the
     operator can read afterwards — what changed, from what to what, and on what
     evidence — and can disagree with.