Load the schema from reuse_surface/hub/ next to store.py and declare package-data so pip install includes the YAML in site-packages. Fixes hub register 500 in the container image.
Add FederationHubAPI spec, hub registration schema, FastAPI hub with SQLite persistence, reuse-surface hub CLI client, Dockerfile, and hub tests. Activate workplan; T05 deploy and T06 ops docs remain open pending railiance01 cutover.