feat: add v2 queued taps and free board rotation

tests/tap-queue.test.js

@@ -0,0 +1,22 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { TapQueue } from '../src/tap-queue.js';
+import { Game, available } from '../src/core.js';
+import { LEVELS } from '../src/levels.js';
+test('rapid taps retain order, ignore duplicate/active pieces, and discard stale IDs',()=>{
+  const queue=new TapQueue();
+  assert.equal(queue.add('a','a'),false);
+  queue.add('b');queue.add('gone');queue.add('c');assert.equal(queue.add('b'),false);
+  const tiles=[{id:'c'},{id:'b'}];
+  assert.equal(queue.take(tiles).id,'b');assert.equal(queue.take(tiles).id,'c');assert.equal(queue.take(tiles),null);
+  queue.add('b');queue.clear();assert.equal(queue.take(tiles),null);
+});
+test('buffered removals are evaluated in order against the updated game, with undo intact',()=>{
+  const game=new Game(LEVELS[0]),queue=new TapQueue();
+  const free=available(game.level,game.tiles).slice(0,3);assert.ok(free.length>=2);
+  for(const tile of free)queue.add(tile.id);
+  const start=game.moves;
+  while(queue.ids.length){const tile=queue.take(game.tiles);assert.equal(game.tap(tile.id).status,'exit');}
+  assert.equal(game.moves,start-free.length);
+  assert.ok(game.undo());assert.equal(game.moves,start-free.length+1);
+});