fix: update builtin-schema snapshot to match upstream pi tool definitions

Author: r3b1s

test/fixtures/builtin-schemas.snapshot.json

@@ -53,13 +53,11 @@
               "type": "string",
               "description": "Replacement text for this targeted edit."
             }
-          },
-          "additionalProperties": false
+          }
         },
         "description": "One or more targeted replacements. Each edit is matched against the original file, not incrementally. Do not include overlapping or nested edits. If two changes touch the same block or nearby lines, merge them into one edit instead."
       }
-    },
-    "additionalProperties": false
+    }
   },
   "write": {
     "type": "object",