feat: add initial skill authoring workspace

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

skills/zhihu-hotlist-screen/references/render-flow.md

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+# Render Flow
+
+Use this flow after `zhihu-hotlist` has already produced ordered hotlist rows.
+
+1. Keep the upstream artifact as the source of truth:
+
+```json
+{
+  "source": "https://www.zhihu.com/hot",
+  "sheet_name": "知乎热榜",
+  "columns": ["rank", "title", "heat"],
+  "rows": [[1, "标题", "344万"]]
+}
+```
+
+2. Call `screen_html_export` with at least:
+
+```json
+{
+  "snapshot_id": "zhihu-hotlist-20260329",
+  "generated_at_ms": 1774713600000,
+  "rows": [[1, "标题", "344万"]]
+}
+```
+
+3. Expect the tool result to include:
+
+```json
+{
+  "output_path": "/abs/path/zhihu-hotlist-screen.html",
+  "presentation": {
+    "mode": "new_tab",
+    "title": "知乎热榜主题分类分析大屏",
+    "url": "file:///abs/path/zhihu-hotlist-screen.html",
+    "open_in_new_tab": true
+  }
+}
+```
+
+4. Final delivery rules:
+
+- The local `.html` path is the generated artifact.
+- `presentation.url` is the browser-open target.
+- Final wording should say the dashboard is ready for 新标签页展示.