fix: normalize equivalent object unions

[sidsri14]

Summary

• normalize pure top-level anyOf object branches when they differ only in one property's type
• compare the normalized object union against an equivalent multi-type property in either direction
• keep correlated multi-property unions intact to avoid widening their accepted values

Closes #22

Verification

• cargo fmt --all -- --check
• cargo test --workspace --all-features
• cargo clippy --all-features --workspace --tests --examples -- -D clippy::all
• git diff --check

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Asymmetric anyOf collapse breaks diffs

Medium Severity

collapse_object_any_of runs independently on each side. When only one pure object anyOf collapses and the other keeps a non-collapsible anyOf, diff_any_of is skipped. Property comparison then treats the remaining anyOf as having no top-level properties, so it emits spurious PropertyRemove changes and misses real branch-level differences.

Additional Locations (1)

• src/diff_walker.rs#L628-L670

 

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