Update README.md

README.md

@@ -80,7 +80,7 @@ The example below requires an agent to combine Meta's official disclosures with
 
 ### Protocol and Metrics
 
-Fifteen model configurations were evaluated using the same ReAct-style agent framework and the same **Web Search**, **Visit**, and **Python** tools. GLM-5.1 served as the automated judge. On 50 randomly sampled evaluation instances annotated and adjudicated by eight finance professionals, the judge achieved a Cohen's $\kappa$ of **0.816** against the human reference labels at the atomic-criterion level.
+Fifteen model configurations were evaluated using the same ReAct-style agent framework and the same **Web Search**, **Visit**, and **Python** tools. GLM-5.1 served as the automated judge. On 50 randomly sampled evaluation instances annotated and adjudicated by eight finance professionals, the judge achieved a Cohen's κ of **0.816** against the human reference labels at the atomic-criterion level.
 
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