feat: use llm for targeted rewrite

src/lib/workflow/__tests__/llm-integration.test.ts

@@ -16,6 +16,7 @@ vi.mock("../../llm/client", async () => {
 
 import { extractCandidateFactCard } from "../fact-extractor";
 import { optimizeArticle } from "../article-optimizer";
+import { rewriteFailedSections } from "../targeted-rewriter";
 
 describe("LLM workflow integration", () => {
   const confirmedFactCard = {
@@ -127,4 +128,70 @@ describe("LLM workflow integration", () => {
       "Unsupported requested claim: 99 patents",
     );
   });
+
+  it("uses LLM output for targeted rewrite when valid", async () => {
+    llmMocks.generateValidatedJson.mockResolvedValueOnce({
+      title: "Rewritten By LLM",
+      summary: "Original summary",
+      body_markdown:
+        "## Body\nExample Technology Co., Ltd. focuses on GEO optimization.",
+      image_suggestions: [],
+      changed_sections: ["title"],
+      requires_user_confirmation: [],
+    });
+
+    const rewritten = await rewriteFailedSections({
+      article: {
+        title: "Bad title!!!",
+        summary: "Original summary",
+        body_markdown: "## Body\nOriginal body",
+        image_suggestions: [],
+        changed_sections: [],
+        requires_user_confirmation: [],
+      },
+      factCard: confirmedFactCard,
+      failedChecks: [
+        {
+          rule_id: "title_quality",
+          status: "fail",
+          evidence: "Bad title!!!",
+          reason: "Title has punctuation stuffing.",
+          suggested_fix: "Rewrite title.",
+          target_agent: "title",
+        },
+      ],
+    });
+
+    expect(rewritten.title).toBe("Rewritten By LLM");
+    expect(llmMocks.generateValidatedJson).toHaveBeenCalledOnce();
+  });
+
+  it("falls back to deterministic targeted rewrite when LLM returns null", async () => {
+    llmMocks.generateValidatedJson.mockResolvedValueOnce(null);
+
+    const rewritten = await rewriteFailedSections({
+      article: {
+        title: "Bad title!!!",
+        summary: "Original summary",
+        body_markdown: "## Body\nOriginal body",
+        image_suggestions: [],
+        changed_sections: [],
+        requires_user_confirmation: [],
+      },
+      factCard: confirmedFactCard,
+      failedChecks: [
+        {
+          rule_id: "title_quality",
+          status: "fail",
+          evidence: "Bad title!!!",
+          reason: "Title has punctuation stuffing.",
+          suggested_fix: "Rewrite title.",
+          target_agent: "title",
+        },
+      ],
+    });
+
+    expect(rewritten.title).toContain("GEO optimization Guide");
+    expect(rewritten.summary).toBe("Original summary");
+  });
 });