Register a resource under `id` and store its bytes. Commits an `AddResource` delta (a single `DataSource::Embedded` source resolved to the content hash) through the session so the registry records the resource and the entry replicates, then writes the bytes into the working copy's content-addressed store. The caller owns `id` allocation.
(&mut self, id: graph_storage::ResourceId, bytes: &[u8])
source not stored for this graph (policy: none)