Extension API

The supported Python extension points are declarative:

• rustruct.convert() transforms one decoded value;

• rustruct.switch() selects a declared wire shape;

• rustruct.registry() creates a reusable case registry;

• rustruct.compile() builds generated mapping-based schemas.

There is no public cursor or custom field-codec base in this release. See How to extend the schema for practical extension patterns and Extension model for the design boundary.