What is being unified?
Physics has several public languages: quantum states, spacetime geometry, gauge fields, particles, records, and observers. OPH treats these as different projections of one consistency problem. Each observer has only a local patch. Physics is what survives when overlapping patches must agree.
This is the unification move. Instead of starting with spacetime as the container for physics, OPH starts with finite access, overlap, and repair. Spacetime, gravity, and particle structure are recovered as stable effective descriptions.