Render Scattergl with ±Inf by coercing ndarray to list and Inf→NaN

[logicstar-ai]

🚀 Fix: Scattergl not drawing line with np.inf but only when in pd.Dataframe

🐞 Root cause

WebGL traces choke on NumPy binary array encoding that contains ±Inf. Lists work because JSON encoder converts Inf to null. When Pandas supplies a NumPy array with Inf, validator left it unchanged, leading to empty render.

🛠️ Fix overview

Detect ±Inf in homogeneous NumPy arrays during validation; replace Inf with NaN and convert the data to a Python list, forcing JSON list encoding so that infinities become null and Scattergl renders correctly.

🧪 Tests

4 / 4 passed
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100% test coverage
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