Advances openfut-core and openfut-bridge to include all bug fixes and
improvements from the workspace review session.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Replace inline subdirectories with git submodules pointing to
the dedicated OpenFUT-Core and OpenFUT-Bridge repositories.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>