Per-axis clinician overrides for the 2017 World Workshop periodontal
classification (getPerioClassification()). Each is either a valid enum
value for that axis or null (not overridden — the derived value from
derivePerioClassification wins). Shared caseMeta fields, not gated.
Patient date of birth (ISO YYYY-MM-DD). PDF-report identity only, like
patientName/examDate; NOT emitted to FHIR.
PDF-report identity — patient display name + exam date (ISO
YYYY-MM-DD). caseMeta fields; NOT emitted to FHIR.
Case-level regional conditions (K07/K09/K11/K12/K00/K13), each with an optional laterality. Manually authored, not derived.