Refactor tool output into trait implementations (#14152)

First state to making tool outputs strongly typed (and `renderable`).

codex-rs/core/src/codex_tests.rs

@@ -46,8 +46,8 @@ use crate::state::TaskKind;
 use crate::tasks::SessionTask;
 use crate::tasks::SessionTaskContext;
 use crate::tools::ToolRouter;
+use crate::tools::context::TextToolOutput;
 use crate::tools::context::ToolInvocation;
-use crate::tools::context::ToolOutput;
 use crate::tools::context::ToolPayload;
 use crate::tools::handlers::ShellHandler;
 use crate::tools::handlers::UnifiedExecHandler;
@@ -89,6 +89,13 @@ use std::time::Duration as StdDuration;
 #[path = "codex_tests_guardian.rs"]
 mod guardian_tests;
 
+fn expect_text_tool_output(output: &dyn std::any::Any) -> String {
+    let Some(output) = output.downcast_ref::<TextToolOutput>() else {
+        panic!("unexpected tool output");
+    };
+    output.text.clone()
+}
+
 struct InstructionsTestCase {
     slug: &'static str,
     expects_apply_patch_instructions: bool,
@@ -2293,6 +2300,7 @@ async fn request_permissions_emits_event_when_reject_policy_allows_requests() {
             }),
             ..Default::default()
         },
+        scope: codex_protocol::request_permissions::PermissionGrantScope::Turn,
     };
 
     let handle = tokio::spawn({
@@ -2377,6 +2385,7 @@ async fn request_permissions_returns_empty_grant_when_reject_policy_blocks_reque
         Some(
             codex_protocol::request_permissions::RequestPermissionsResponse {
                 permissions: codex_protocol::models::PermissionProfile::default(),
+                scope: codex_protocol::request_permissions::PermissionGrantScope::Turn,
             }
         )
     );
@@ -4133,13 +4142,7 @@ async fn rejects_escalated_permissions_when_policy_not_on_request() {
         })
         .await;
 
-    let output = match resp2.expect("expected Ok result") {
-        ToolOutput::Function {
-            body: FunctionCallOutputBody::Text(content),
-            ..
-        } => content,
-        _ => panic!("unexpected tool output"),
-    };
+    let output = expect_text_tool_output(&*resp2.expect("expected Ok result"));
 
     #[derive(Deserialize, PartialEq, Eq, Debug)]
     struct ResponseExecMetadata {