core: indirect draw passes, device feature list, drop handles-specific bundle heuristics

Amp-Thread-ID: https://ampcode.com/threads/T-01a0b2dd-db32-712d-99ce-12ce4a86d979
Co-authored-by: Heaust Azure <heaust.azure@gmail.com>

core/index.js

@@ -48,6 +48,8 @@ export class YawnCore {
   #pending = new Map();
   #profileListeners = new Set();
   #next = 1;
+  /** Optional WebGPU features the device has (WebGPU spelling); populated once `ready` resolves. */
+  features = new Set();
 
   constructor(canvas, { arenaBytes = 64 * 1024 * 1024, debug = false, workerFactory } = {}) {
     if (!canvas) throw new TypeError("canvas is required");
@@ -62,6 +64,7 @@ export class YawnCore {
     const offscreen = canvas.transferControlToOffscreen?.() ?? canvas;
     this.ready = this.#request("init", { canvas: offscreen, arenaBytes }, [offscreen]).then(async result => {
       this.#buffer = result.buffer;
+      this.features = new Set(result.features);
       for (const descriptor of result.rows) this.#arrays.set(
         descriptor.name,
         new SharedRows(this.#buffer, descriptor),