Two people editing the canvas no longer overwrite each other

No More Silent Overwrites

On a shared robot, two people opening the canvas at the same time used to be a quiet disaster: both make changes, both save, and whoever saved last wins. The other person's work disappears without any warning — and usually nobody notices until something stops working.

The canvas now coordinates editing.

What's New

• You can see who's editing — The canvas shows when someone else currently holds the edit session
• Changes aren't silently lost — Instead of two conflicting saves racing each other, the second person is told what's going on
• The lock releases itself — Closing the canvas or walking away hands editing back, so nobody stays blocked by a forgotten browser tab
• Viewing is always free — Looking at the canvas, panning, and zooming never take the lock, so anyone can watch what's running

Why This Matters

Robots are usually shared — a colleague debugging perception while you rewire the canvas is normal. Knowing that someone else is mid-edit is the difference between coordinating for ten seconds and spending an afternoon working out why your configuration reverted.