Function resolve_fieldwise 

pub fn resolve_fieldwise(
    request: &FieldwiseRealizationRequest,
    requirements: FieldwiseRealizationRequirements,
    capabilities: &RealizationCapabilities,
) -> Result<ResolvedFieldwiseRealization, Diagnostic>

Resolve one explicit field-wise request without fallback.

Errors

Returns EQ0807 for Domain or exact unknown-Field drift, a structurally invalid plan, or an unsupported complete backend capability.