Fix: AgentInputItem should be imported using `import type` syntax

[shiraiwa0425]

Description

The AgentInputItem type is currently imported using regular import syntax in the documentation examples, but it should be imported using import type syntax since it's a type-only export.

Current Behavior

The example code shows:

import {
  Agent,
  AgentInputItem,  // ❌ This causes an error
  run,
  tool,
  user,
  withTrace,
} from '@openai/agents';

Error Message

SyntaxError: The requested module '@openai/agents' does not provide an export named 'AgentInputItem'

Expect Behavior

import {
  Agent,
  run,
  tool,
  user,
  withTrace,
  type AgentInputItem,  // ✅ Correct way
} from '@openai/agents';

Affected Documentation

Running agents guide:chat-threads
Other example code that imports AgentInputItem

Environment

Package: @openai/agents [v0.0.14]
TypeScript version: [v5.8.3]
Node.js version: [v22.16.3]

Additional Context

This is important because new users following the documentation will encounter errors when trying to run the example code. The documentation should reflect the correct import syntax for type-only exports.

[seratch]

Thanks for sharing this feedback. I don't think this is always problematic, but there is no reason to avoid type imports in code snippets.