fix(cli): add LocalGPT label on follow-up responses and redirect tracing to stderr

Co-authored-by: yiwang <142937+yiwang@users.noreply.github.com>

Author: Copilot

crates/cli/src/cli/chat.rs

@@ -497,7 +497,7 @@ pub async fn run(args: ChatArgs, agent_id: &str) -> Result<()> {
                                         );
                                     }
                                 }
-                                print!("{}", follow_up);
+                                print!("\nLocalGPT: {}", follow_up);
                                 stdout.flush()?;
                             }
                             Err(e) => {

crates/cli/src/main.rs

@@ -30,6 +30,7 @@ fn main() -> Result<()> {
                 tracing_subscriber::EnvFilter::try_from_default_env()
                     .unwrap_or_else(|_| tracing_subscriber::EnvFilter::new(log_level)),
             )
+            .with_writer(std::io::stderr)
             .init();
         return crate::cli::gen3d::run(args, &cli.agent);
     }
@@ -66,6 +67,7 @@ async fn async_main(cli: Cli) -> Result<()> {
             tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| tracing_subscriber::EnvFilter::new(log_level)),
         )
+        .with_writer(std::io::stderr)
         .init();
 
     match cli.command {