feat: restructure docs

docs/developers/tools/memory.md

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+# Memory Tool (`save_memory`)
+
+This document describes the `save_memory` tool for Qwen Code.
+
+## Description
+
+Use `save_memory` to save and recall information across your Qwen Code sessions. With `save_memory`, you can direct the CLI to remember key details across sessions, providing personalized and directed assistance.
+
+### Arguments
+
+`save_memory` takes one argument:
+
+- `fact` (string, required): The specific fact or piece of information to remember. This should be a clear, self-contained statement written in natural language.
+
+## How to use `save_memory` with Qwen Code
+
+The tool appends the provided `fact` to your context file in the user's home directory (`~/.qwen/QWEN.md` by default). This filename can be configured via `contextFileName`.
+
+Once added, the facts are stored under a `## Qwen Added Memories` section. This file is loaded as context in subsequent sessions, allowing the CLI to recall the saved information.
+
+Usage:
+
+```
+save_memory(fact="Your fact here.")
+```
+
+### `save_memory` examples
+
+Remember a user preference:
+
+```
+save_memory(fact="My preferred programming language is Python.")
+```
+
+Store a project-specific detail:
+
+```
+save_memory(fact="The project I'm currently working on is called 'qwen-code'.")
+```
+
+## Important notes
+
+- **General usage:** This tool should be used for concise, important facts. It is not intended for storing large amounts of data or conversational history.
+- **Memory file:** The memory file is a plain text Markdown file, so you can view and edit it manually if needed.