Module id 

Stable entity identity and provenance.

See docs/DATA_MODEL.md §8. A deliberate divergence from the conventional design, and the reason this has to live in the foundation crate rather than being added later.

Conventionally, topology is identified by pointer. Every modeling operation allocates new nodes, so every reference into a previous result dies. That is the topological naming problem, and every downstream fix is an attempt to reconstruct identity after the fact by walking history maps.

Here an entity’s identity is what produced it, and from what. A rebuild with different parameters runs the same operations over the same inputs and therefore produces entities with the same provenance, so a reference like “the fillet on this edge” survives a change to an unrelated dimension.

Provenance does not replace operation history: history is what a binding layer consumes, and it is the honest answer where provenance cannot resolve a reference. It is the primary mechanism, not the only one.

Structs

EntityId

A stable identity for a topological entity, valid for the lifetime of a document.

OpId

Identifies one invocation of a modeling operation.

ProvenanceTable

Assigns EntityIds and remembers what each one came from.

Role

What an entity is, relative to the operation that made it.

SourceId

Identifies an imported document.

Enums

Provenance

Where an entity came from.