fix(agent-loop): update required properties to include workdir and ti… (#530)

Without this I get an issue running codex it in a docker container. I
receive:

```
{
    "answer": "{\"role\":\"user\",\"content\":[{\"type\":\"input_text\",\"text\":\"\\\"Say hello world\\\"\"}],\"type\":\"message\"}\n{\"id\":\"error-1745325184914\",\"type\":\"message\",\"role\":\"system\",\"content\":[{\"type\":\"input_text\",\"text\":\"⚠️  OpenAI rejected the request (request ID: req_f9027b59ebbce00061e9cd2dbb2d529a). Error details: Status: 400, Code: invalid_function_parameters, Type: invalid_request_error, Message: 400 Invalid schema for function 'shell': In context=(), 'required' is required to be supplied and to be an array including every key in properties. Missing 'workdir'.. Please verify your settings and try again.\"}]}\n"
}
```

This fix makes it work.

codex-cli/src/utils/agent/agent-loop.ts

@@ -649,7 +649,7 @@ export class AgentLoop {
                           "The maximum time to wait for the command to complete in milliseconds.",
                       },
                     },
-                    required: ["command"],
+                    required: ["command", "workdir", "timeout"],
                     additionalProperties: false,
                   },
                 },