Locked working definition
The Bridge is preserved relational history made active in the present.
Einstein only as structural analogy
Cite the Einstein field equation only as a structural analogy for how a geometry and a source term can stand in relation. It is not an amended physics. There is no tensor theatre.
Gμν + Λ gμν = (8πG/c4) Tμν
The analogy is limited to this: a left-hand structure and a right-hand source can be written so that each side remains inspectable. If the analogy is asked to do more than that, discard it.
Independently movable frame variables
T · time
S · context
D · separation
If S and D never separate in the data, discard one. A serious geometry does not keep two names for the same movement. Completion is not added as a fourth axis in order to make the diagram look finished.
Completion is an outcome
Completion is an outcome under activation, not a fourth axis and not a cathedral.
Relational completion names what happens when preserved history is recognised and reused consequentially in a present. It is scored after the fact. It is not a dimension you travel along. Building a cathedral of extra axes is a way of refusing failure.
Falsifier for this note: if S and D never separate under wording control, the frame is overfitted. See Addendum I and the carrier protocol.