HIP: accelerate PSF accumulation and restore parallel producers

Cooperate across 32 lanes per PSF and use two completion-protected staging slots with complete batch timing. Restore coarse OpenMP event production while serializing shared GPU submissions and direct fallback boundaries.

Add bounded benchmarks, streaming and renderer regressions, and preserve validation evidence and ownership documentation.

README.zh-CN.md

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 当前实现支持解析 **Minkowski** 与 **Schwarzschild** 时空、单张图像、基于观测者轨迹的图像序列、自适应透镜网格，以及可复用的透镜映射文件。程序主要使用 C 编写，通过 OpenMP 实现 CPU 并行；可选的 HIP 后端用于加速 PSF 累积。
 
+HIP 保留并行 CPU catalog 映射，并使用由完成事件保护的有界上传缓冲。配置与小规模性能检查见 [HIP 构建说明](build.md#optional-hip-psf-acceleration)。
+
 [Nmesh](https://github.com/nmeshsource/nmesh) 数值时空后端和双黑洞（BBH）渲染仍在规划中。当前范围为黑洞捕获与远处恒星背景，暂不包含局域物质辐射、吸积盘或等离子体。架构与开发路线参见[设计文档](nr_spacetime_movie_renderer_design.md)。
 
 ## 编译