Move more sentinel references to lowercase

Author: hrolfurgylfa

pyrefly/lib/query.rs

@@ -425,10 +425,9 @@ fn type_shape_kind(context: &TypeShapeContext, ty: &Type) -> TypeShapeKind {
             "typing.Literal",
             vec![named_leaf(literal.value.to_string())],
         ),
-        Type::Sentinel(sentinel) => named_type_shape_kind(
-            "typing_extensions.Sentinel",
-            vec![named_leaf(format!("{}", sentinel))],
-        ),
+        Type::Sentinel(sentinel) => {
+            named_type_shape_kind("sentinel", vec![named_leaf(format!("{}", sentinel))])
+        }
         Type::LiteralString(_) => {
             named_type_shape_kind("typing_extensions.LiteralString", Vec::new())
         }

pyrefly/lib/tsp/type_conversion.rs

@@ -362,7 +362,7 @@ impl TypeConverter<'_> {
             PyreflyType::Materialization => builtin("Unknown"),
 
             // --- Sentinel type ---
-            PyreflyType::Sentinel(_) => builtin("Sentinel"),
+            PyreflyType::Sentinel(_) => builtin("sentinel"),
         }
     }