Replace addons with conventional handles

Provide the single-loadout Scene API, SAB-backed meshes, cameras, materials, lights, workers, post effects, and tutorial playgrounds. Batch matching row growth so active GPU loadouts refresh once.

Amp-Thread-ID: https://ampcode.com/threads/T-01a01380-b478-77d0-84a0-102880a5c5ae
Co-authored-by: Heaust Azure <heaust.azure@gmail.com>

core/worker.js

@@ -21,6 +21,9 @@ addEventListener("message", async ({ data: message }) => {
         case "create-rows":
           result = JSON.parse(core.create_rows(message.name, message.rows, message.stride, message.format));
           break;
+        case "create-rows-batch":
+          result = JSON.parse(core.create_rows_batch(JSON.stringify(message.rows)));
+          break;
         case "delete-rows":
           core.delete_rows(message.name);
           break;