Speed up artifact downloads

platform_web/api/client.test.ts

@@ -352,6 +352,19 @@ describe("PlatformApiClient AI providers", () => {
           }
         });
       }
+      if (url.endsWith("/api/v1/artifacts/artifact-1/content")) {
+        return new Response(new TextEncoder().encode("artifact full body").buffer, {
+          status: 200,
+          headers: {
+            "Content-Type": "application/octet-stream",
+            "Content-Length": "18",
+            "X-Artifact-Id": artifact.id,
+            "X-Artifact-Checksum": artifact.checksum,
+            "X-Artifact-Content-Checksum": "sha256:fullchecksum",
+            "X-Artifact-Storage": "platform-memory-transfer-session"
+          }
+        });
+      }
       if (url.endsWith("/api/v1/server-instances/workflows/create") && init?.method === "POST") {
         return jsonResponse({ accepted: true, action: "create", instance: { ...server, state: "installing" }, job: { ...job, capability: "process.install" } });
       }
@@ -611,6 +624,7 @@ describe("PlatformApiClient AI providers", () => {
     await expect(client.listArtifacts({ ownerKind: "job", ownerId: job.id, state: "available" })).resolves.toMatchObject({ count: 1, items: [{ id: artifact.id }] });
     await expect(client.openArtifactDownload(artifact.id)).resolves.toMatchObject({ downloadUrl: "/api/v1/artifacts/artifact-1/content", rangeSupported: true });
     await expect(client.readArtifactContent(artifact.id, 0, 8)).resolves.toMatchObject({ contentLength: 8, contentRange: "bytes 0-7/18", checksum: artifact.checksum });
+    await expect(client.downloadArtifactContent(artifact.id).then((response) => response.arrayBuffer())).resolves.toHaveProperty("byteLength", 18);
     await expect(client.createServerWorkflow({ id: "server-2", pluginId: plugin.id, name: "Server 2", idempotencyKey: "idem-create" })).resolves.toMatchObject({
       action: "create"
     });
@@ -659,7 +673,7 @@ describe("PlatformApiClient AI providers", () => {
       client.invokeAI({ requestId: "ai-1", serverInstanceId: server.id, purpose: "config.suggest", prompt: "Tune PVP safely", currentConfig: "server.name=Example Survival #1\n" })
     ).resolves.toMatchObject({ status: "ok", usage: { mocked: true }, configRecommendation: { diffSummary: "review required" } });
 
-    expect(fetchMock).toHaveBeenCalledTimes(45);
+    expect(fetchMock).toHaveBeenCalledTimes(46);
   });
 
   it("normalizes server file workspace null arrays from older platform responses", async () => {