Consolidate command execution output into aggregated_output (#50402)

## What changed

- Remove `stdout`, `stderr`, and `formatted_output` from `CommandExecutionItem` and `ExecCommandEndEvent`, retaining `aggregated_output` as the output field.
- Update command event producers, legacy conversion, rollout traces, and the precomputed schema. Use aggregated output for terminal trace results.
- Clear `interaction_input` in emitted and migrated command completion items.

## Testing

Update command execution and trace tests to use aggregated output, and assert that legacy rollout migration preserves `aggregatedOutput`.

GitOrigin-RevId: ed59827d4a5ec9a767084ee4feac72c2042440f2

codex-rs/thread-store/src/local/rollout_migration/legacy_event.rs

@@ -277,16 +277,12 @@ pub(super) fn completed_item(
                 cwd: event.cwd.clone(),
                 parsed_cmd: event.parsed_cmd.clone(),
                 source: event.source,
-                interaction_input: event.interaction_input.clone(),
+                interaction_input: None,
                 status: event.status.clone().into(),
-                stdout: (!event.stdout.is_empty()).then(|| event.stdout.clone()),
-                stderr: (!event.stderr.is_empty()).then(|| event.stderr.clone()),
                 aggregated_output: (!event.aggregated_output.is_empty())
                     .then(|| event.aggregated_output.clone()),
                 exit_code: Some(event.exit_code),
                 duration: Some(event.duration),
-                formatted_output: (!event.formatted_output.is_empty())
-                    .then(|| event.formatted_output.clone()),
             }),
             Some(event.turn_id.clone()),
         )),

codex-rs/thread-store/src/local/rollout_migration_tests.rs

@@ -471,6 +471,7 @@ async fn migration_projects_explicit_and_implicit_legacy_completed_items() {
     let reasoning: serde_json::Value =
         serde_json::from_slice(&items.items[1].item_json).expect("parse projected reasoning");
     assert_eq!(command["type"], "commandExecution");
+    assert_eq!(command["aggregatedOutput"], "ok");
     assert_eq!(reasoning["type"], "reasoning");
     assert_eq!(reasoning["summary"], json!(["summary"]));
     assert_eq!(reasoning["content"], json!(["raw"]));