Mission favors explicit contracts over tolerated shapes.

• Zod v4 schemas validate persisted and externally accepted data.
• TypeScript data types are inferred from those schemas.
• Entity contracts bind method metadata to Entity classes.
• State store transactions are the canonical write interface for accepted state.
• Open Mission consumes published schemas, snapshots, events, and command views.

Compatibility shims, fallback parsers, and silent normalization are rejected unless an ADR records the exception.