Harden issue artifact metadata

ui/src/lib/issue-output.test.ts

@@ -100,6 +100,7 @@ describe("getIssueOutputs", () => {
     const result = getIssueOutputs([
       makeWorkProduct({ id: "pr-1", type: "pull_request" }),
       makeWorkProduct({ id: "doc-1", type: "document" }),
+      makeWorkProduct({ id: "artifact-1", type: "artifact", provider: "custom", metadata: videoMetadata() }),
     ]);
     expect(result.count).toBe(0);
     expect(result.primary).toBeNull();

ui/src/lib/issue-output.ts

@@ -123,7 +123,7 @@ function toTime(value: string | Date): number {
  *   marked primary) comes first, then remaining artifacts by most-recent.
  */
 export function getIssueOutputs(workProducts: IssueWorkProduct[] | null | undefined): IssueOutputs {
-  const artifacts = (workProducts ?? []).filter((wp) => wp.type === "artifact");
+  const artifacts = (workProducts ?? []).filter((wp) => wp.type === "artifact" && wp.provider === "paperclip");
 
   const items: IssueOutputItem[] = artifacts.map((wp) => {
     const parsed = attachmentArtifactWorkProductMetadataSchema.safeParse(wp.metadata);