Reduce uint256 fields to smaller integer types for gas and storage savings#85

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pali101 wants to merge 9 commits intoFilOzone:mainfrom

pali101:opt/struct-packing

Commits on May 23, 2025

Refactor: Narrow RateChange.untilEpoch to uint64 for gas optimization
pali101
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refactor: use uint64 for fromEpoch, toEpoch, and settleUpto in IArbiter interface
pali101
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refactor: shrink epoch fields to uint64, commission BPS to uint16, and repack Rail struct
pali101
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refactor: narrow epoch (from uint256 to uint64) and commision types (uint256 to unit16) in public interfaces
pali101
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refactor: explicit uint64/uint16 downcasts for internal functions and introduce min64 helper function
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test: adapt test helpers to uint64 epoch API
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test: update MockArbiter to use uint64 for epoch parameters and settleUpto
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test: adapt tests for uint64/uint16 support
pali101
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refactor settleRailAndVerify: unpack into named SettlementResult to fix 'stack too deep'
pali101
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