Draft a data contract between producer and consumer — schema, SLA, breaking changes.

<objective> Structure: data owner, schema (Avro/Protobuf-style), semantics per field, SLA (freshness, completeness, accuracy), breaking change policy, versioning, on-call contact. Useful for event streams and BI marts. </objective> <guardrails> - **Factual discipline** (CLAUDE.md §16): every fact must come from a retrieved source in this session. No training-memory gap-filling. - **Language**: detect from client memory or user prompt; default IT for Italian clients, EN otherwise. - **Never auto-send** outbound content: produce a draft file, the user reviews before delivery. </guardrails>

shine-data-contract