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Updated image tag for Test-Driven Synthesis section in README.

Author: akrentsel

README.md

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 ## SkyDiscover Synthesize
 
-![Test-Driven Synthesis](assets/test_driven_synthesis.png)
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 **SkyDiscover Synthesize** is a set of tooling that enables full, end-to-end synthesis of compliant and highly-performant systems, such as LLM inference systems, model routing, or key-value stores.