docs: remove execution chain section

README.md

@@ -200,17 +200,6 @@ PhoneClaw/
 └── README.md
 ```
 
-实际执行链路：
-
-```
-用户输入
-  → PromptBuilder 组装提示词
-  → Gemma 4 本地推理
-  → 需要能力时调用 load_skill
-  → 读取对应 SKILL.md
-  → 执行原生工具
-  → 返回最终中文结果
-```
 
 ## 常见问题
 

README_EN.md

@@ -200,17 +200,6 @@ PhoneClaw/
 └── README.md
 ```
 
-Execution chain:
-
-```
-User input
-  → PromptBuilder assembles the prompt
-  → Gemma 4 runs local inference
-  → Calls load_skill when a capability is needed
-  → Reads the corresponding SKILL.md
-  → Executes the native tool
-  → Returns the final response
-```
 
 ## FAQ