fix(context-loader): write the prepared document verbatim on stdout

The two output routes disagreed by one byte: `-o` wrote the document as
serialized, while stdout appended a newline. A consumer that hashes what it
reads to detect drift would get different answers depending on which route it
used, which is the opposite of what a single-producer wire format is for.

core/wren-context-loader/src/main.rs

@@ -52,7 +52,9 @@ fn main() -> ExitCode {
                 return ExitCode::from(1);
             }
         }
-        None => println!("{document}"),
+        // `print!`, not `println!`: the `-o` path writes the document verbatim, and a consumer
+        // that hashes what it reads would see the two routes disagree by one byte.
+        None => print!("{document}"),
     }
     ExitCode::SUCCESS
 }