docs: update top paper link to arXiv

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

Author: varun369

README.md

@@ -7,7 +7,7 @@
 [![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE)
 [![Python 3.11+](https://img.shields.io/badge/python-3.11%2B-blue.svg)](https://www.python.org/downloads/)
 
-**[Website](https://www.superlocalmemory.com/skillfortify)** | **[PyPI](https://pypi.org/project/skillfortify/)** | **[Paper (Zenodo)](https://doi.org/10.5281/zenodo.18787663)** | **[Wiki](https://github.com/varun369/skillfortify/wiki)**
+**[Website](https://www.superlocalmemory.com/skillfortify)** | **[PyPI](https://pypi.org/project/skillfortify/)** | **[Paper (arXiv)](https://arxiv.org/abs/2603.00195)** | **[Wiki](https://github.com/varun369/skillfortify/wiki)**
 
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