Make the Zindra interior river navigable: add lock mechanics at Terri and Oritz dams

Issue:

The Zindra interior river (the "3"-shaped waterway between Terri and Oritz) is currently non-navigable because both ends are blocked by dams. Water level differences between sims prevent boats from crossing. As a result, this long interior waterway has almost no vehicle traffic, and GTFO deliveries cannot pass through.

Why it matters:

The river is already there. It just needs to be connected.

Oritz has an SL Hub. With navigable locks, it could become a real waterway stop instead of a dead end.

Dams currently consume prims and space but generate no activity. Making them functional would turn them into visitable, useful infrastructure.

Proposed solution:

Add localized lock mechanics at Terri and Oritz — similar to real canal locks or water elevators. When a boat enters the lock zone, the system raises or lowers it to the target sim's water level, then releases it. This is a known, feasible approach and does not require reworking SL's entire water system.

Request:

Please evaluate lock mechanics as a navigable-waterway feature, prioritizing GTFO-compatible vehicles, so interior rivers like Zindra's can support continuous boat traffic instead of ending at a dam.