docs: refine AGENTS placement rules

Author: Copilot

AGENTS.md

@@ -16,11 +16,15 @@
 - Unrelated refactors, bulk renames, repo-wide formatting, or unrelated file changes. / 与任务无关的重构、批量重命名、全仓格式化或其他无关改动。
 - Generated artifacts, temporary files, logs, binaries, local environment files, or secrets. / 提交生成物、临时文件、日志、二进制文件、本地环境文件或任何密钥等敏感信息。
 - Dependency churn, third-party/imported code changes, or weakened/removed tests unless the task explicitly requires them. / 除非任务明确要求，否则禁止随意变更依赖、修改第三方/导入代码，或弱化/删除测试。
+- Creating Markdown documents without explicit instructions. / 没有明确指令时，禁止随意新建 Markdown 文档。
+- Placing code in the wrong directory or creating new subdirectories under major directories without a clear requirement. / 禁止乱放代码，禁止在主要目录下无明确要求时新建子目录。
+- Editing a BSP `rtconfig.h` by hand; generate it from `.config` with `scons --menuconfig` or `scons --pyconfig-silent`. / 禁止手工修改 BSP 的 `rtconfig.h`；应通过 `scons --menuconfig` 或 `scons --pyconfig-silent` 基于 `.config` 生成。
 - History rewrites or overwriting others' work. / 改写历史或覆盖他人工作成果。
 
 ## Placement / 放置规则
 
 - Use existing directories such as `bsp/`, `components/`, `documentation/`, `examples/`, `include/`, `libcpu/`, `src/`, and `tools/`. / 使用现有目录，如 `bsp/`、`components/`、`documentation/`、`examples/`、`include/`、`libcpu/`、`src/`、`tools/`。
+- BSP code only in `bsp/`; kernel code in `src/`; tests/examples in `examples/`; component code in `components/`; abstracted driver code in `components/drivers/`; chip or architecture shared porting code in `libcpu/`. / 板级支持包代码只放在 `bsp/`；内核代码放在 `src/`；测试/例程代码放在 `examples/`；组件代码放在 `components/`；抽象层驱动相关代码放在 `components/drivers/`；芯片或架构公共移植代码放在 `libcpu/`。
 - Keep repository-entry files such as `AGENTS.md`, `README.md`, and `LICENSE` in the root; put general documentation in `documentation/`. / `AGENTS.md`、`README.md`、`LICENSE` 等仓库入口文件放在根目录；通用文档放在 `documentation/`。
 
 ## Precedence / 优先级