Expected Diagnostics: prd-frs-invalid.md

contract.field.missing: owner is required.
contract.metric.too_low: the document is below the target word band.
contract.assertion.contains_any_missing: goals do not mention measure, metric, or success.
contract.section.missing: functional-requirements is required.
contract.section.recommended_missing: non-goals is recommended.
contract.section.discouraged: implementation-plan is discouraged in this contract.