fix(qa): declare delivery thread identity

src/plugin-sdk/qa-runner-runtime.test.ts

@@ -4,6 +4,7 @@
 import path from "node:path";
 import type { Command } from "commander";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import type { QaRunnerCliRegistration } from "./qa-runner-runtime.js";
 import {
   cleanupTempDirs,
   expectPrivateQaLabRuntimeSurfaceLoad,
@@ -77,6 +78,21 @@ describe("plugin-sdk qa-runner-runtime", () => {
     }
   });
 
+  it("exposes structured thread identity to transport delivery adapters", () => {
+    type Adapter = Awaited<
+      ReturnType<NonNullable<QaRunnerCliRegistration["adapterFactory"]>["create"]>
+    >;
+    const buildAgentDelivery: Adapter["buildAgentDelivery"] = ({ target, threadId }) => ({
+      channel: "linked",
+      replyChannel: "linked",
+      replyTo: threadId ? `${target}:thread:${threadId}` : target,
+    });
+
+    expect(buildAgentDelivery({ target: "channel:room", threadId: "topic-1" }).replyTo).toBe(
+      "channel:room:thread:topic-1",
+    );
+  });
+
   it("stays cold until runner discovery is requested", async () => {
     await import("./qa-runner-runtime.js");
 

src/plugin-sdk/qa-runner-runtime.ts

@@ -154,7 +154,7 @@ type QaRunnerTransportAdapterDefinition = {
     timeoutMs?: number;
     pollIntervalMs?: number;
   }) => Promise<void>;
-  buildAgentDelivery: (params: { target: string }) => {
+  buildAgentDelivery: (params: { target: string; threadId?: string }) => {
     channel: string;
     to?: string;
     replyChannel: string;