test: cover worker startup stderr

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: yuranich

.cursor/skills/qv-sdk-pr-create/SKILL.md

@@ -77,8 +77,6 @@ TICKET prefix[tags]: subject
 
 ## PR Body
 ```markdown
-**Note**: be concise and prefer bullet points.
-
 ## 🎯 What problem does this PR solve?
 ...
 ```
@@ -174,6 +172,7 @@ Before outputting the PR description, verify:
 - [ ] `[api]` tag has usage example
 - [ ] `[mod]` tag has Added/Removed models list
 - [ ] Description is concise - bullet points, no fluff
+- [ ] Generated helper notes, template instructions, and tool footers are removed from the PR body
 - [ ] If diff touches `packages/sdk/package.json` deps/version, the sync skill ran (or `--no-sync` was set with a reminder emitted), and `check:deps-vs-sdk` passes
 - [ ] If base is `release-<pkg>-<x.y.z>`, the dual-PR flow ran (or `--no-backmerge` was set), and both PR URLs are reported
 

packages/sdk/scripts/repro-worker-startup-error.ts

@@ -0,0 +1,55 @@
+import test from "brittle";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const nativeLoadErrorMarker = "QVAC_REPRO_NATIVE_LOAD_ERROR";
+
+function collectErrorDetails(error: Error | undefined) {
+  if (!error) return "";
+
+  const cause = (error as { cause?: unknown }).cause;
+  const causeMessage = cause instanceof Error ? cause.message : "";
+  return `${error.message}\n${causeMessage}`;
+}
+
+test("loadModel() startup failure includes worker stderr in RPC init error cause", async function (t) {
+  t.timeout(15_000);
+
+  process.env["QVAC_WORKER_PATH"] = path.resolve(
+    __dirname,
+    "fixtures/native-load-failure-worker.mjs",
+  );
+
+  const { loadModel } = await import("@/client/api/load-model");
+  const { close } = await import("@/client/rpc/rpc-client");
+
+  t.teardown(async () => {
+    try {
+      await close();
+    } catch {}
+    delete process.env["QVAC_WORKER_PATH"];
+  });
+
+  let startupError: Error | undefined;
+  try {
+    await loadModel({
+      modelSrc: "/tmp/qvac-repro-model.gguf",
+      modelType: "llamacpp-completion",
+    });
+    t.fail("loadModel() resolved unexpectedly - expected worker startup failure");
+  } catch (error) {
+    startupError = error as Error;
+  }
+
+  t.ok(startupError, "expected loadModel() to reject");
+  t.is(
+    (startupError as { name?: string } | undefined)?.name,
+    "RPC_INIT_TIMEOUT",
+    `expected RPC_INIT_TIMEOUT, got name=${(startupError as { name?: string } | undefined)?.name}`,
+  );
+  t.ok(
+    collectErrorDetails(startupError).includes(nativeLoadErrorMarker),
+    "expected SDK error details to include worker stderr",
+  );
+});