[Do not land - test copilot] Update README.md

Author: metascroy

README.md

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 Deploy **LLMs, vision, speech, and multimodal models** with the same PyTorch APIs you already know—accelerating research to production with seamless model export, optimization, and deployment. No manual C++ rewrites. No format conversions. No vendor lock-in.
 
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   <summary><strong>📘 Table of Contents</strong></summary>
 
 - [Why ExecuTorch?](#why-executorch)