| The current TERPSICHORE-native migration slice already covers the reduced | |
| internal-region stability path, but it does not yet correctly establish the | |
| first wall-coupled external-region capability needed for vacuum plus conducting | |
| wall analysis. | |
| Read the provided method context and source snapshot, run the public | |
| reproduction, and complete the missing capability so the implementation no | |
| longer behaves like an internal-only scaffold when a vacuum region and an | |
| explicit conducting wall are part of the problem. A correct solution should let | |
| materially different conducting walls produce distinct global potential-energy | |
| and stability observations while the no-explicit-wall fallback remains | |
| available. | |
| Constraints: | |
| - keep the solution generic and array-based; | |
| - do not hard-code the public reproduction values; | |
| - preserve the no-explicit-wall fallback path; | |
| - keep the public reproduction runnable without internet access. | |