feat(web): complete product workflow implementation

web/protocol/core-scene-commands.ts

@@ -1,4 +1,4 @@
-import type { WebEngineEditCommand } from "./web-engine";
+import type { MeshPrimitive, WebEngineEditCommand } from "./web-engine";
 
 type CoreCommand<T extends WebEngineEditCommand["type"]> = Extract<WebEngineEditCommand, { type: T }>;
 type Vector3 = [number, number, number];
@@ -7,6 +7,9 @@ const vector3 = (value: readonly number[]): Vector3 => [value[0] ?? 0, value[1]
 
 /** Typed constructors used by the workbench for the source-backed scene API. */
 export const coreSceneCommands = Object.freeze({
+  createPrimitive(primitive: MeshPrimitive, location: readonly number[] = [0, 0, 0], name?: string): CoreCommand<"createPrimitive"> {
+    return { type: "createPrimitive", primitive, location: vector3(location), ...(name ? { name } : {}) };
+  },
   createCube(location: readonly number[] = [0, 0, 0], name?: string): CoreCommand<"createPrimitive"> {
     return { type: "createPrimitive", primitive: "CUBE", location: vector3(location), ...(name ? { name } : {}) };
   },