refactor(agent): dedupe harness and command workflows

test/helpers/dispatch-inbound-capture.ts

@@ -0,0 +1,18 @@
+import { vi } from "vitest";
+
+export function buildDispatchInboundCaptureMock<T extends Record<string, unknown>>(
+  actual: T,
+  setCtx: (ctx: unknown) => void,
+) {
+  const dispatchInboundMessage = vi.fn(async (params: { ctx: unknown }) => {
+    setCtx(params.ctx);
+    return { queuedFinal: false, counts: { tool: 0, block: 0, final: 0 } };
+  });
+
+  return {
+    ...actual,
+    dispatchInboundMessage,
+    dispatchInboundMessageWithDispatcher: dispatchInboundMessage,
+    dispatchInboundMessageWithBufferedDispatcher: dispatchInboundMessage,
+  };
+}

test/helpers/mock-incoming-request.ts

@@ -0,0 +1,23 @@
+import type { IncomingMessage } from "node:http";
+import { EventEmitter } from "node:events";
+
+export function createMockIncomingRequest(chunks: string[]): IncomingMessage {
+  const req = new EventEmitter() as IncomingMessage & { destroyed?: boolean; destroy: () => void };
+  req.destroyed = false;
+  req.headers = {};
+  req.destroy = () => {
+    req.destroyed = true;
+  };
+
+  void Promise.resolve().then(() => {
+    for (const chunk of chunks) {
+      req.emit("data", Buffer.from(chunk, "utf-8"));
+      if (req.destroyed) {
+        return;
+      }
+    }
+    req.emit("end");
+  });
+
+  return req;
+}