Remove debug prints and unused code

- Remove all debug println statements
- Remove unused service_tracker module
- Remove unused struct fields and methods
- Remove empty placeholder files (cpu.rs, memory.rs, defaults.rs)
- Fix all compiler warnings
- Clean build with zero warnings

Version bump to 0.1.159

dashboard/src/main.rs

@@ -51,10 +51,6 @@ struct Cli {
     /// Run in headless mode (no TUI, just logging)
     #[arg(long)]
     headless: bool,
-
-    /// Show raw agent data in headless mode
-    #[arg(long)]
-    raw_data: bool,
 }
 
 #[tokio::main]
@@ -90,7 +86,7 @@ async fn main() -> Result<()> {
     }
 
     // Create and run dashboard
-    let mut dashboard = Dashboard::new(cli.config, cli.headless, cli.raw_data).await?;
+    let mut dashboard = Dashboard::new(cli.config, cli.headless).await?;
 
     // Setup graceful shutdown
     let ctrl_c = async {