Can I vibecode Skribbl?

Build me a canvas for running several coding agents at once, like Skribbl. Requirements:

- Electron plus React, with React Flow for the pan/zoom canvas and xterm.js plus
  node-pty for the terminals. No web version, this is a desktop app.
- Each node is a real shell in its own process, spawned with node-pty in a working
  directory I pick per node. Double click empty canvas to add one, and let me type in
  it exactly like a normal terminal.
- Node position, size, title and cwd persist to a JSON file in the Electron userData
  folder, restored on launch. The shells themselves do not survive, say so in the UI
  rather than pretending they do.
- Spawn each shell inside `tmux new-session -A -s <nodeId>` so a crashed window can
  reattach to the running agent instead of killing it. Budget real time for this, the
  reattach and scrollback restore is the fiddly part of the whole build.
- Drag from one node to another to draw a link, and store the links with a direction.
  Right click a link to delete it. Links are just recorded relationships for now, no
  message passing between agents.
- A top bar counting tokens per node, parsed from each agent CLI's own usage output.
  Keep input, output, cache write and cache read as four separate counters, never sum
  them into one number, a cache read costs about a tenth of an input token.
- Out of scope: multiplayer, cloud sync, code signing, and any status indicator you
  would have to infer by scraping terminal output. Guessing wrong there is worse than
  showing nothing.
- README with the node-pty rebuild step for your Electron version, which is the one
  thing that will break on a fresh machine.