[sunrioa]

Summary

A truncated image returned by a tool can leave a run stuck during model request preparation. Classify invalid image headers and decode failures as terminal invalid_image errors. The failed run settles and releases the investigation slot so queued work can proceed.

Verification

• In the macOS integration build, a truncated image terminated the run and a valid image reached the provider.
• A discovery regression verified that a failed investigation released the slot and the next queued investigation completed.
• The standalone macOS regression passed. It checks that a truncated image ends the run and a valid image still reaches the provider.

AI use

• No generative tool made a substantive contribution
• Generative tooling made a substantive contribution

Tool(s) and scope: OpenAI Codex assisted with implementation, regression coverage, verification, and drafting.

Checklist

• Tests cover the change and fail without it
• Format, typecheck and the affected suites pass locally

Does this PR entail a change in behavior?

• Yes
• No

简体中文

工具返回截断的图片时，运行可能卡在模型请求准备阶段。现在，无效的图片头和解码失败会作为终态错误 invalid_image 处理。失败的运行会结束并释放调查位，队列里的任务可以继续执行。

macOS 联调验证了截断图片会结束运行、有效图片能送达模型服务，以及失败的调查释放位置后下一轮能正常完成。独立分支上的坏图与有效图片回归测试也已通过。

OpenAI Codex 协助了实现、回归测试、验证和正文起草。