feat(web): continue source-backed implementation waves

web/protocol/geometry-node-commands.ts

@@ -0,0 +1,9 @@
+import type { GeometryNodeGraphIR } from "./geometry-nodes";
+import type { WebEngineEditCommand } from "./web-engine";
+
+/** Workbench constructors for validated Geometry Node graph transactions. */
+export const geometryNodeCommands = Object.freeze({
+  setGraph(meshId: string, graph: GeometryNodeGraphIR): Extract<WebEngineEditCommand, { type: "setGeometryNodeGraph" }> {
+    return { type: "setGeometryNodeGraph", meshId, graph };
+  },
+  } as const);