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fix: use NewDocumentConfiguration() as default config in BuildV3Model

When calling NewDocument() (without explicit configuration), BuildV3Model()
was creating a bare DocumentConfiguration struct literal as the fallback.
This meant all bool fields defaulted to false (Go zero values), causing
TransformSiblingRefs and MergeReferencedProperties to be silently disabled.

BuildV2Model() already correctly uses datamodel.NewDocumentConfiguration()
as its fallback. This aligns BuildV3Model() to do the same, ensuring
features like sibling $ref -> allOf transformation are enabled by default
regardless of which NewDocument constructor is used.

Fixes: #90
Co-authored-by: Cursor <cursoragent@cursor.com>

fix

fix

bump coverage

fixed missing import.

windows test fixing

windows pain

updated coverage

fixed borked import