chore: checkpoint before Python removal

vendor/anstream/examples/query-stream.rs

@@ -0,0 +1,22 @@
+//! Report a terminal's capabilities
+
+fn main() {
+    println!("stdout:");
+    println!(
+        "  choice: {:?}",
+        anstream::AutoStream::choice(&std::io::stdout())
+    );
+    println!(
+        "  choice: {:?}",
+        anstream::AutoStream::auto(std::io::stdout()).current_choice()
+    );
+    println!("stderr:");
+    println!(
+        "  choice: {:?}",
+        anstream::AutoStream::choice(&std::io::stderr())
+    );
+    println!(
+        "  choice: {:?}",
+        anstream::AutoStream::auto(std::io::stderr()).current_choice()
+    );
+}