| Extend the current TERPSICHORE-native external-region implementation so it can |
| correctly support the `projection_wall` geometry mode, not just the simpler wall |
| construction already present in the reduced source snapshot. |
|
|
| Inspect the source snapshot and run the public reproduction, then complete the |
| implementation so projection-wall geometry changes propagate through the |
| pseudo-vacuum construction and into downstream external-region scientific |
| payloads. |
|
|
| Use the supported `projection_wall` configuration and observed behavior to |
| trace the representation through the external-region implementation. |
|
|
| For this task, `projection_wall` should be treated as a wall-construction |
| regime rather than a cosmetic parameter tweak. The constructed outer geometry |
| must remain compatible with the existing downstream external-region machinery; |
| it should not introduce a disconnected one-off path that only satisfies a |
| single reproduction case. |
|
|
| Constraints: |
|
|
| - keep the solution generic and array-based; |
| - do not hard-code the public reproduction values; |
| - preserve the simpler wall mode already supported by the snapshot; |
| - keep the public reproduction runnable without internet access. |
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|
