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CONTRACT

This SDK must not add business logic.

Required Conformance

Must consume vatfix/VATFIX/schema/claim.schema.json
Must emit vatfix/VATFIX/schema/result.schema.json
Must use failure codes from vatfix/VATFIX/FAILURE_CODES.json
Must be a thin wrapper around VATFIX standards

Prohibited

Custom validation logic
Schema modifications
Additional failure codes
Business rule interpretation

SDK is a transport layer, not a decision layer.