Replace IL LIHEAP simplified payment model with full benefit matrix#7963

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hua7450 wants to merge 6 commits intoPolicyEngine:mainfrom

hua7450:il-liheap-benefit-matrix

Commits on Apr 9, 2026

Replace IL LIHEAP simplified payment model with full benefit matrix

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Remove unused base_amount min/max parameters

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Default IL LIHEAP fuel type to all electric

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Address PR review: derive fuel type, fix bracket thresholds, cap at expenses

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Infer fuel type from expenses, add all heating expense categories

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Clamp negative income to bracket 1 in IL LIHEAP income bracket

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