Add tested depth and pose fusion bridge

README.md

@@ -20,3 +20,8 @@ The preview is not a 3D reconstruction. Future adapters can add depth/pose
 estimation, multi-view fusion, and Gaussian optimization
 behind the same manifest. Each adapter must report its model, runtime, input
 hashes, and held-out-view metrics.
+
+`depth_bridge.py` now defines and tests the handoff contract for those adapters:
+normalized depth plus optional confidence, intrinsics, and world-to-camera pose
+become confidence-weighted, source-aware fused points. It performs no learned
+inference, so the contract can be validated before a model backend is selected.