Update README.md

Author: t81dev

README.md

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 README.md — Visitor-facing overview, focused onboarding, and first-steps guidance.
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-# t81lib — Balanced ternary quantization & core numerics
+# t81 — Balanced Ternary for AI & Numerics
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+
 
 ![CI](https://github.com/t81dev/t81lib/actions/workflows/ci.yml/badge.svg)
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