Add arXiv paper badge and citation to README

Links the published research paper (arXiv:2603.27277) in both the
badge row and as a callout block above the Security & Trust section.

Author: DeusData

README.md

@@ -11,11 +11,14 @@
 [![OpenSSF Scorecard](https://api.scorecard.dev/projects/github.com/DeusData/codebase-memory-mcp/badge)](https://scorecard.dev/viewer/?uri=github.com/DeusData/codebase-memory-mcp)
 [![SLSA 3](https://slsa.dev/images/gh-badge-level3.svg)](https://slsa.dev)
 [![VirusTotal](https://img.shields.io/badge/VirusTotal-0%2F72_engines-brightgreen?logo=virustotal)](https://www.virustotal.com/gui/file/dcbe9a951a2b1f7ec6d003edce2f38b586f74bf8cf98faeedec36f1dd3444b06/detection)
+[![arXiv](https://img.shields.io/badge/arXiv-2603.27277-b31b1b?logo=arxiv)](https://arxiv.org/abs/2603.27277)
 
 **The fastest and most efficient code intelligence engine for AI coding agents.** Full-indexes an average repository in milliseconds, the Linux kernel (28M LOC, 75K files) in 3 minutes. Answers structural queries in under 1ms. Ships as a single static binary for macOS, Linux, and Windows — download, run `install`, done.
 
 High-quality parsing through [tree-sitter](https://tree-sitter.github.io/tree-sitter/) AST analysis across all 66 languages, enhanced with LSP-style hybrid type resolution for Go, C, and C++ (more languages coming soon) — producing a persistent knowledge graph of functions, classes, call chains, HTTP routes, and cross-service links. 14 MCP tools. Zero dependencies. Plug and play across 10 coding agents.
 
+> **Research** — The design and benchmarks behind this project are described in the paper [*Codebase-Memory: Tree-Sitter-Based Knowledge Graphs for LLM Code Exploration via MCP*](https://arxiv.org/abs/2603.27277) (arXiv:2603.27277). Evaluated across 31 real-world repositories: 83% answer quality, 10× fewer tokens, 2.1× fewer tool calls vs. file-by-file exploration.
+
 > **Security & Trust** — This tool reads your codebase and writes to your agent configuration files. That is what it is designed to do. If you prefer to audit before running, the [full source is here](https://github.com/DeusData/codebase-memory-mcp) — every release binary is signed, checksummed, and scanned by 70+ antivirus engines. All processing happens 100% locally; your code never leaves your machine. Found a security issue? We want to know — see [SECURITY.md](SECURITY.md). Security is Priority #1 for us.
 
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