Context
The research record preserves failed approaches when they expose a model boundary, an invalid transfer, or an unsupported strengthening.
Proof or evidence
the explicit batch DAG computes independent products. A block-diagonal embedding still omits dense cross-block products. The multiplicity-to- inference is supplied by Schönhage's separate asymptotic tensor theorem, not by an ordinary topological schedule of the batch.
Verification notes
The failure status and preserved lesson are recorded in the cumulative failure ledger.
Limitations
- distinguish executable direct-sum extraction from the asymptotic transformation that converts its border-rank bound into a dense matrix exponent.