Purpose: freezes a unit of worker scope. Schema: schemas/contracts/work-package.schema.json. Required: schema_version, id, name, objective, dependencies, owned_paths; optional fields include forbidden paths, validation, provider preferences, and review policy. Valid/invalid examples: examples.json#/work-package.
Lifecycle: approval freezes the package before execution; dependencies must reference existing packages and owned paths must not overlap. The planner produces it; workers consume its scope; the scheduler enforces dependency readiness. Versioning/migration: provisional 1.x schema, additive optional fields only; incompatible change needs migration. Maturity: provisional.