A pulsing highlight region ("pointing without touching") — dismissed by clicking it.
Who placed the item. Drives the ownership chrome (chips / violet vs slate-amber).
Stable item id (e.g. sticky-3) — referenced by connectors, deltas and agent tools.
sticky-3
Optional
Render order (higher renders on top). Assigned by the engine.
A pulsing highlight region ("pointing without touching") — dismissed by clicking it.