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  "instructions": "# AGENTS.md — cpp/cuda/qcu/python\n\nPython 面向的 C API 声明。C++ CUDA 后端与 Python Cython 桥的接口边界。\n\n## 文件\n\n| 文件 | 用途 |\n|---|---|\n| `pyqcu.h` | C API 头 — 22 个 `extern \"C\"` 函数，指针以 `long long` 传递 |\n\n**必须与 `pyqcu/cuda/qcu/qcu.pxd` 精确同步**（Cython 声明文件）。任何不匹配导致静默内存损坏。\n\n所有函数接收三个参数数组：\n- `set_ptrs` (int64[100])：C++ 运行时管理的 scratch 缓冲指针\n- `params` (int32[54])：格点维度、网格大小、数据类型、迭代次数、计划选择\n- `argv` (float64[7])：mass、atol、sigma、MG 容差\n\nC++→Python 数据指针从 `tensor.contiguous().data_ptr()` 转为 `long long`。",
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