Native Jupyter-style notebook for DeepSeek Harness

Key features

• Real persistent kernelipykernel + jupyter_client sidecar — variables persist across cells.
• A stateful, Agent-controllable Jupyter workspace for DeepSeek Harness.
• Live tqdm progress bars and inline figures with click-to-zoom.
• Agent tools to read, edit, run, and inspect cells (nb_get, nb_edit_cell, nb_run_cell, ...) with structured access to outputs and tracebacks.
• Runtime introspection for agentsnb_context, nb_list_vars, and nb_inspect_object expose live kernel variables and compact notebook state