Tiptap command/history reproducers in portable JSON

[PerchAnton]

I built an external adapter and replay example for small, shareable regression traces. Three scenarios exercise tiptap 3.32.0 and StarterKit: Unicode replacement, bold history and redo invalidation, including literal angle brackets. All 16 steps pass.

It mounts the real editor in jsdom so history plugins are installed. Browser input, focus and layout still need browser tests. Prepared with Codex.

I maintain the experimental interaction-check runner. The example uses pinned stable packages, stays outside the project and adds no runtime dependency. Feedback on whether this helps share small reproducers is welcome.