Add memstate-ai/memstate-mcp to Knowledge & Memory section

Memstate AI provides versioned memory for AI coding agents with:
- Structured keypaths (hierarchical dot-notation like project.myapp.auth.provider)
- Full version history and conflict detection
- O(1) token retrieval regardless of memory size
- 4x more accurate than alternatives on open benchmarks
- Works with Claude, Cursor, Cline, Kilo Code via npx @memstate/mcp

README.md

@@ -1094,6 +1094,7 @@ Persistent memory storage using knowledge graph structures. Enables AI models to
 - [louis030195/easy-obsidian-mcp](https://github.com/louis030195/easy-obsidian-mcp) 📇 🏠 🍎 🪟 🐧 - Interact with Obsidian vaults for knowledge management. Create, read, update, and search notes. Works with local Obsidian vaults using filesystem access.
 - [mattjoyce/mcp-persona-sessions](https://github.com/mattjoyce/mcp-persona-sessions) 🐍 🏠 - Enable AI assistants to conduct structured, persona-driven sessions including interview preparation, personal reflection, and coaching conversations. Built-in timer management and performance evaluation tools.
 - [mem0ai/mem0-mcp](https://github.com/mem0ai/mem0-mcp) 🐍 🏠 - A Model Context Protocol server for Mem0 that helps manage coding preferences and patterns, providing tools for storing, retrieving and semantically handling code implementations, best practices and technical documentation in IDEs like Cursor and Windsurf
+- [memstate-ai/memstate-mcp](https://github.com/memstate-ai/memstate-mcp) 📇 ☁️ - Versioned memory for AI coding agents with structured keypaths, conflict detection, and full version history. Memories are stored as hierarchical dot-notation keypaths (e.g. `project.myapp.auth.provider`) enabling O(1) token retrieval. 4× more accurate than alternatives on open benchmarks. Works with Claude, Cursor, Cline, Kilo Code, and any MCP client via `npx @memstate/mcp`.
 - [michael-denyer/memory-mcp](https://github.com/michael-denyer/memory-mcp) 🐍 🏠 🍎 🪟 🐧 - Two-tier memory with hot cache (instant injection) and cold semantic search. Auto-promotes frequently-used patterns, extracts knowledge from Claude outputs, and organizes via knowledge graph relationships.
 - [mercurialsolo/counsel-mcp](https://github.com/mercurialsolo/counsel-mcp) 📇 ☁️ 🏠 🍎 🪟 🐧 - Connect AI agents to the Counsel API for strategic reasoning, multi-perspective debate analysis, and interactive advisory sessions.
 - [modelcontextprotocol/server-memory](https://github.com/modelcontextprotocol/servers-archived/tree/main/src/memory) 📇 🏠 - Knowledge graph-based persistent memory system for maintaining context