feat(org-chart): add core cards and fixed-layout integration

examples/org-chart/index.html

@@ -0,0 +1,28 @@
+<!doctype html>
+<html lang="ko">
+<head>
+  <meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>HM OrgChart · Vanilla JSON 예제</title>
+  <link rel="icon" href="data:,">
+  <link rel="stylesheet" href="./assets/hm-theme.css"><link rel="stylesheet" href="./demo.css">
+</head>
+<body>
+  <main>
+    <h1>OrgChart Core · JSON 예제</h1>
+    <p>가상 조직·직원 데이터입니다. 표시된 원본 직원 수는 업무상 재직 총원과 구분됩니다.</p>
+    <div class="demo-controls" aria-label="Core 실행 예제">
+      <button id="reload" type="button">JSON 재로드</button>
+      <button id="update" type="button">직원 이동·추가 반영</button>
+      <button id="destroy" type="button">인스턴스 정리</button>
+      <button id="recreate" type="button">새 인스턴스 생성</button>
+    </div>
+    <p id="status" role="status" aria-live="polite">준비 중</p>
+    <div id="chart-host"></div>
+  </main>
+  <script type="module">
+    import * as HMOrgChart from './assets/index.js';
+    import { startDemo } from './app.js';
+    startDemo(HMOrgChart);
+  </script>
+</body>
+</html>