fix(core) serialize shell_command (#6744)

## Summary
Ensures we're serializing calls to `shell_command`

## Testing
- [x] Added unit test

codex-rs/core/src/client_common.rs

@@ -136,7 +136,7 @@ fn reserialize_shell_outputs(items: &mut [ResponseItem]) {
 }
 
 fn is_shell_tool_name(name: &str) -> bool {
-    matches!(name, "shell" | "container.exec")
+    matches!(name, "shell" | "container.exec" | "shell_command")
 }
 
 #[derive(Deserialize)]

codex-rs/core/src/tools/parallel.rs

@@ -112,7 +112,7 @@ impl ToolCallRuntime {
 
     fn abort_message(call: &ToolCall, secs: f32) -> String {
         match call.tool_name.as_str() {
-            "shell" | "container.exec" | "local_shell" | "unified_exec" => {
+            "shell" | "container.exec" | "local_shell" | "shell_command" | "unified_exec" => {
                 format!("Wall time: {secs:.1} seconds\naborted by user")
             }
             _ => format!("aborted by user after {secs:.1}s"),