Add structured comparison history support for JSON/YAML output formats#12

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Commits on Jul 26, 2025

Initial plan for comparison history in JSON/YAML output

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Implement comparison history in JSON/YAML output

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Clean up test artifacts and finalize implementation

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Fix lint failures: update imports, remove range over int, and upgrade golangci-lint config

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Revert golangci-lint configuration to original state

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Address review feedback: revert range syntax, move comparison to compute, fix summary.go readability, revert history

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