feat: 建立统一语义文档模型

packages/renderer/tests/render-markdown.test.ts

@@ -32,6 +32,14 @@ const answer = 42;
     expect(result.bodyHtml).toContain("hljs-keyword");
     expect(result.bodyHtml).toContain("footnote");
     expect(result.metadata.title).toBe("示例文档");
+    expect(result.semanticDocument).toEqual({
+      schemaVersion: 1,
+      titlePolicy: {
+        metadataTitle: "suppress",
+        firstBodyHeading: "keep"
+      },
+      regions: []
+    });
     expect(result.features).toEqual(
       expect.arrayContaining(["code", "table", "task-list", "footnote"])
     );
@@ -152,6 +160,8 @@ document:
     expect(result.articleHtml).toContain(
       '<footer class="doc-edition">'
     );
+    expect(result.semanticDocument.profile).toBe("official");
+    expect(result.semanticDocument.regions).toHaveLength(2);
     expect(result.bodyHtml).not.toContain("doc-masthead");
   });