fix: gate code-mode tool filtering behind cfg(feature) for --no-defau… (#8111)

Signed-off-by: Rodolfo Olivieri <rolivier@redhat.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/goose/src/agents/reply_parts.rs

@@ -154,6 +154,7 @@ impl Agent {
             .await;
         #[cfg(not(feature = "code-mode"))]
         let code_execution_active = false;
+        #[cfg(feature = "code-mode")]
         if code_execution_active {
             let disclosure_style =
                 crate::agents::platform_extensions::code_execution::get_tool_disclosure();