[hansen_singleton] Replace pandas-datareader with direct FRED / Fama-French downloads#925

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fix-hansen-pandas-datareader

Commits on Jun 21, 2026

[hansen_singleton] replace pandas-datareader with direct FRED/Fama-French fetch

mmcky
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claude
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[hansen_singleton] read vendored data snapshot instead of fetching inline

mmcky
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claude
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[hansen_singleton] cache the vendored CSV at cell scope

mmcky
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claude
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