Add ContextMemory integration guide

This guide explains how to use ContextMemory for persisting development context in picoclaw. It includes installation instructions, initialization steps, and usage examples.

docs/CONTEXTMEMORY.md

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+# ContextMemory Integration Guide
+
+This guide explains how picoclaw contributors can optionally use ContextMemory to persist development context across AI-assisted coding sessions.
+
+## Overview
+
+ContextMemory is a CLI tool that helps developers save and restore their working context, including:
+
+- Current task
+- Goals and decisions
+- Implementation progress
+- Next planned steps
+
+This can be useful when working with AI coding assistants such as ChatGPT, Claude, or Cursor, allowing contributors to resume work without manually reconstructing project context.
+
+ContextMemory does not modify picoclaw source code and is entirely optional.
+
+---
+
+## Installation
+
+Install ContextMemory globally using npm:
+
+```bash
+npm install -g @akashkobal/contextmemory
+```
+
+Verify installation:
+
+```bash
+contextmemory --help
+```
+
+---
+
+## Initialize in picoclaw Repository
+
+From the picoclaw project root directory:
+
+```bash
+contextmemory init
+```
+
+This creates a `.contextmemory/` directory used to store development context locally.
+
+Example structure:
+
+```
+.contextmemory/
+├── context.json
+├── history/
+```
+
+This directory is local to your development environment.
+
+---
+
+## Saving Development Context
+
+To save your current picoclaw development state:
+
+```bash
+contextmemory save "Working on picoclaw feature implementation"
+```
+
+This records relevant information such as:
+
+- Task description  
+- Current progress  
+- Development decisions  
+- Next steps  
+
+You can update context at any time during development.
+
+---
+
+## Resuming Development Context
+
+To restore previously saved context:
+
+```bash
+contextmemory resume
+```
+
+This copies a formatted context summary to your clipboard.
+
+You can paste it into your AI coding assistant to restore development continuity.
+
+---
+
+## Optional MCP Integration
+
+If using an MCP-compatible AI tool, add the following configuration:
+
+```json
+{
+  "mcpServers": {
+    "contextmemory": {
+      "command": "npx",
+      "args": ["-y", "@akashkobal/contextmemory", "mcp"]
+    }
+  }
+}
+```
+
+This allows compatible tools to access stored context automatically.
+
+---
+
+## Example Use Cases in picoclaw Development
+
+ContextMemory may be useful for:
+
+- Large feature development  
+- Multi-session contributions  
+- Refactoring tasks  
+- AI-assisted debugging  
+- Tracking architectural decisions  
+
+---
+
+## Notes
+
+- ContextMemory is optional  
+- It does not change picoclaw functionality  
+- It stores context locally in your development environment  
+- It can be safely ignored if not needed  
+
+---
+
+## Related Links
+
+- [View package on npm](https://www.npmjs.com/package/@akashkobal/contextmemory)
+- [View profile on GitHub](https://github.com/AkashKobal/contextmemory)