fix(engine): realistic worker memory budget + sizing/feedback telemetry

packages/cli/src/commands/feedback.telemetryJoinKeys.test.ts

@@ -0,0 +1,39 @@
+import { describe, expect, it } from "vitest";
+import { buildTelemetryJoinKeys } from "./feedback.js";
+
+describe("buildTelemetryJoinKeys", () => {
+  it("emits fid + tid and omits renders when the ring is empty", () => {
+    const keys = buildTelemetryJoinKeys({
+      feedbackId: "feedback-uuid",
+      anonymousId: "install-uuid",
+    });
+    expect(keys).toBe("fid=feedback-uuid tid=install-uuid");
+  });
+
+  it("appends recent render ids newest-last with a ! marking failed renders", () => {
+    const keys = buildTelemetryJoinKeys({
+      feedbackId: "f",
+      anonymousId: "t",
+      recentRenders: [
+        { id: "render-a", at: "2026-07-21T00:00:00Z", ok: true },
+        { id: "render-b", at: "2026-07-21T01:00:00Z", ok: false },
+      ],
+    });
+    expect(keys).toBe("fid=f tid=t renders=render-a,render-b!");
+  });
+
+  it("stays within the backend env cap for a full ring of uuid render ids", () => {
+    const uuid = "01234567-89ab-cdef-0123-456789abcdef";
+    const keys = buildTelemetryJoinKeys({
+      feedbackId: uuid,
+      anonymousId: uuid,
+      recentRenders: Array.from({ length: 5 }, (_, i) => ({
+        id: uuid,
+        at: "2026-07-21T00:00:00Z",
+        ok: i % 2 === 0,
+      })),
+    });
+    // submitFeedback caps env at 500 chars; the doctor summary consumes ~100.
+    expect(keys.length).toBeLessThan(400);
+  });
+});