Context
The research record preserves failed approaches when they expose a model boundary, an invalid transfer, or an unsupported strengthening.
Proof or evidence
Run 5 transitions are unlabelled. They do not by themselves preserve gate types, arithmetic counts, depth, coefficients, copying, or precision.
Verification notes
The failure status and preserved lesson are recorded in the cumulative failure ledger.
Limitations
- carry Run 2 arithmetic/depth receipts separately or develop a resource-labelled bisimulation theorem.