Function repl_command 

pub async fn repl_command(
    project: Option<PathBuf>,
    no_sandbox: bool,
    model: Option<String>,
    provider_url: Option<String>,
    api_key: Option<String>,
    confirm: bool,
    no_agents_md: bool,
    compact: bool,
    no_markdown: bool,
) -> Result<()>

Main REPL loop for interactive mode.