refactor(api): migrate JSON instances to Exp.IsEra constraints with comprehensive golden tests#1042

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newhoggy wants to merge 2 commits intomasterfrom

newhoggy/upgrade-instances

Commits on Nov 30, 2025

test(golden): add comprehensive golden tests for TxOut JSON serialization
newhoggy
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refactor(api): migrate JSON instances to use Exp.IsEra constraints
newhoggy
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