Error `Invalid output type` should provide additional agent state and output information

[AndyRightNow]

Please read this first

• Have you read the docs? Agents SDK docs
• Have you searched for related issues? Others may have had similar requests

Describe the feature

Here this line

openai-agents-js/packages/agents-core/src/runImplementation.ts

Line 614 in 0858c98

throw new ModelBehaviorError('Invalid output type');

It simply throws an empty error without any additional information, such as what is the potential output and what is the parsing error. The trace that this run generates also doesn't really contain much information, just ZodError.

It would be really helpful if any error after receiving a potential output can have all the states so far tracked not only in the error thrown but also the trace and span stats.

[seratch]

Fair enough, the message string of this exception can have more helpful information.