# H-Mode as Boundary-Route Preservation in Magnetically Confined Plasma

## Abstract stub

We interpret the L-mode to H-mode transition as a boundary-admissibility transition in the UNNS Substrate. The central claim is that the plasma edge reorganizes from turbulent route-fragmentation into a route-preserving confinement layer, producing improved energy retention while also storing pedestal load that may relax through ELMs.

## Planned sections

1. Introduction
2. Plasma confinement and the H-mode problem
3. UNNS boundary-admissibility hypothesis
4. Edge admissibility margin
5. Pedestal load and ELM overload
6. Data sources and canonical schema
7. Pilot analysis
8. Discussion
9. Failure conditions
10. Conclusion
