Update README.md

Author: qectorlab

README.md

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 [![License](https://img.shields.io/badge/License-Source_Available-blue)](LICENSE)
 ![Downloads](https://img.shields.io/badge/Downloads-20.8k%20(total)-brightgreen)
 ![Monthly](https://img.shields.io/badge/Monthly-9k%2B-brightgreen)
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 **Source-available Rust/Python quantum error correction decoding platform.**
 
 **v0.6.2**: Hardened Union-Find family with explicit hypergraph rejection (no more silent wrong results on unsupported codes) + comprehensive validation.