feat(task-017): implement git publishing dry-run and commit flow

apps/frontend/src/features/article-detail/model.ts

@@ -11,6 +11,7 @@ export type DetailSummary = {
   articleId: string;
   status: string;
   publishingStatus: string;
+  publishingValidationLabel: string;
   briefDescription: string;
   targetSite: string;
   updatedAt: string;
@@ -47,6 +48,7 @@ export function buildDetailSummary(detail: ArticleDetailResponse): DetailSummary
     articleId: detail.article.id,
     status: detail.article.status,
     publishingStatus: detail.article.publishing_status,
+    publishingValidationLabel: resolvePublishingValidationLabel(detail),
     briefDescription: detail.article.brief_description,
     targetSite: detail.target_site?.name ?? "Unknown",
     updatedAt: detail.article.updated_at,
@@ -55,6 +57,20 @@ export function buildDetailSummary(detail: ArticleDetailResponse): DetailSummary
   };
 }
 
+function resolvePublishingValidationLabel(detail: ArticleDetailResponse): string {
+  const manifest = detail.publish_commit?.content_bundle_manifest;
+  if (manifest && typeof manifest === "object") {
+    const validation = (manifest as Record<string, unknown>).validation;
+    if (validation && typeof validation === "object") {
+      const label = (validation as Record<string, unknown>).label;
+      if (typeof label === "string" && label.trim()) {
+        return label;
+      }
+    }
+  }
+  return "Best-effort content-shape validation only.";
+}
+
 export function buildProductionArtifactRows(
   jobs: readonly AgentJobSummary[],
 ): ProductionArtifactRow[] {

apps/frontend/src/features/article-detail/ui.tsx

@@ -26,6 +26,10 @@ export function ArticleDetailShell({ summary }: DetailShellProps) {
           <dt>Publishing status</dt>
           <dd>{summary.publishingStatus}</dd>
         </div>
+        <div>
+          <dt>Validation</dt>
+          <dd>{summary.publishingValidationLabel}</dd>
+        </div>
         <div>
           <dt>Target site</dt>
           <dd>{summary.targetSite}</dd>

apps/frontend/tests/article_detail.model.test.mjs

@@ -15,7 +15,7 @@ const compiled = ts.transpileModule(source, {
 const moduleExports = {};
 new Function("exports", compiled.outputText)(moduleExports);
 
-const { buildProductionArtifactRows } = moduleExports;
+const { buildDetailSummary, buildProductionArtifactRows } = moduleExports;
 
 const rows = buildProductionArtifactRows([
   {
@@ -102,3 +102,40 @@ assert.equal(rows[0].status, "SUCCEEDED");
 assert.deepEqual(rows[0].usedEvidenceIds, ["e1", "e2"]);
 assert.equal(rows[1].status, "FAILED");
 assert.deepEqual(rows[1].unsupportedClaims, ["Unverified claim"]);
+
+const detailSummary = buildDetailSummary({
+  article: {
+    id: "a1",
+    target_site_id: "site1",
+    status: "PUBLISH_COMMIT_CREATED",
+    publishing_status: "PUBLISH_COMMIT_CREATED",
+    brief_description: "desc",
+    language: "en",
+    content_type: "longform_guide",
+    created_at: "2026-05-21T00:00:00Z",
+    updated_at: "2026-05-21T00:00:00Z",
+  },
+  target_site: { name: "Demo Site" },
+  workflow_events: [],
+  agent_jobs: [],
+  publish_commit: {
+    id: "pc1",
+    article_id: "a1",
+    target_site_id: "site1",
+    repository_url: "/tmp/repo.git",
+    branch: "main",
+    commit_sha: "abc123",
+    status: "PUBLISH_COMMIT_CREATED",
+    created_at: "2026-05-21T00:00:00Z",
+    content_bundle_manifest: {
+      validation: {
+        label: "Best-effort content-shape validation only.",
+      },
+    },
+  },
+});
+
+assert.equal(
+  detailSummary.publishingValidationLabel,
+  "Best-effort content-shape validation only.",
+);