Add vault-cortex to Knowledge & Memory

README.md

@@ -1674,6 +1674,7 @@ Persistent memory storage using knowledge graph structures. Enables AI models to
 
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+- [aliasunder/vault-cortex](https://github.com/aliasunder/vault-cortex) [![vault-cortex MCP server](https://glama.ai/mcp/servers/aliasunder/vault-cortex/badges/score.svg)](https://glama.ai/mcp/servers/aliasunder/vault-cortex) 📇 🏠 ☁️ - MCP server for Obsidian vaults — search, memory, link graph, 23 tools, OAuth-protected.
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