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Notebook preview (0.54)

hedron-notebook remains localhost-only / tooling-grade. It is not a Supported production server.

Display handles

DisplayHandle operations: update, snapshot, open_in_browser, close. Static fallbacks: as_html(), as_text(), image placeholder. Multi-view sessions use NotebookSession with deterministic cleanup.

Security and topology

  • Non-loopback hosts are rejected by default (HED-NOTEBOOK-TOPOLOGY).
  • Token failures use HED-NOTEBOOK-TOKEN.
  • Snapshots redact tokens and local paths.
  • Opt-in real-server handoff prints an explicit security/topology disposition and never silently binds a public interface.

Frontend matrix

Supported evidence targets JupyterLab / classic-compatible frontends where available, IPython current/previous lines, VS Code notebook disposition, and headless saved-output rendering across Python 3.11–3.14.