Context
Cartesian support tensors have an exact asymptotic packing rate. This is a policy/graph dictionary; it does not by itself construct an expression-level prefix automaton realizing a code.
Proof or evidence
Apply FPRD-SH-T25 at every power and take roots. For universality, represent each graph edge by a shared token and pad every vertex support with private tokens to the common positive width max(1, Delta(G)).
Verification notes
Uniform support representations reproduce all 1,099 simple graphs through five vertices; tensor products were checked on every graph through four vertices.
Limitations
- Unrestricted policies inherit the full difficulty of general Shannon capacity.
- The identity alone does not improve a classical capacity bound.
- A tensor signature is already a vertex of the strong power; expression reachability is a separate semantic layer.