fix(cli): better message when only --headed is ignored in attach mode

In CDP-attach mode (the default since 0.24.0-fork.1), --headed has no
effect — the user's existing Chrome is already visible, and the
generic "use 'agent-browser close' first to restart" advice doesn't
help (the new daemon attaches right back). Explicitly say --headed is
moot and point to --launch as the actual escape hatch.

Other ignored flags (--profile, --proxy, etc.) keep the existing
"close + reopen" message because for those it IS the right advice.

cli/src/main.rs

@@ -822,6 +822,18 @@ fn main() {
         .collect();
 
         if !ignored_flags.is_empty() && !flags.json {
+            // Special case: --headed is irrelevant in CDP-attach mode
+            // (your existing Chrome is always already visible). The
+            // "agent-browser close + reopen" advice doesn't help because
+            // the new daemon will attach right back to the same Chrome.
+            // Don't suggest a useless workaround.
+            if ignored_flags == ["--headed"] {
+                eprintln!(
+                    "{} --headed has no effect when attached to your running Chrome (it's already visible). \
+                     Pass --launch to spawn a separate browser if you need to control headedness.",
+                    color::warning_indicator(),
+                );
+            } else {
                 eprintln!(
                     "{} {} ignored: daemon already running. Use 'agent-browser close' first to restart with new options.",
                     color::warning_indicator(),
@@ -829,6 +841,7 @@ fn main() {
                 );
             }
         }
+    }
 
     // Validate mutually exclusive options
     if flags.cdp.is_some() && flags.provider.is_some() {