fix(cli): clarify 'Can Delegate' field meaning in agent show

Fixes bounty issue #1381

The 'Can Delegate' field now displays 'yes/no' instead of 'true/false'
and includes a brief explanation '(allows spawning sub-agents)' to help
users understand what the delegation capability means.

Author: factorydroid

cortex-cli/src/agent_cmd.rs

@@ -781,7 +781,10 @@ async fn run_show(args: ShowArgs) -> Result<()> {
     println!("Source: {}", agent.source);
     println!("Native: {}", agent.native);
     println!("Hidden: {}", agent.hidden);
-    println!("Can Delegate: {}", agent.can_delegate);
+    println!(
+        "Can Delegate: {} (allows spawning sub-agents)",
+        if agent.can_delegate { "yes" } else { "no" }
+    );
 
     if let Some(ref model) = agent.model {
         println!("Model: {model}");