feat: rework datastream into catalog events, add gguf metadata
- Rework the datastream endpoint into a catalog/event model (DatastreamEvent,
SubscriptionRequest, channel/stream descriptors, DatastreamPublisherActor) across
endpoint/frame/mux/wire/views.
- Add gguf_metadata planning reader, a dashboard hardware view, and iroh-driver
datastream transport.
- Grow mvp-system orchestrator/worker_node bins and staging/provisioning; rename
mvp_one_node_chat->mvp_chat; extend tinygrad worker.
Signed-off-by: Zachery Aaron Shores-Chmielewski <zacheryasc@gmail.com>