style: format reproduction test

Failing reproduction only. The captured @tintinweb/pi-subagents 0.19.0
foreground Agent result has no Output file line, so the adapter hands
Paseo no child transcript to read.

packages/server/src/server/agent/providers/pi/extensions/tintinweb-pi-subagents/index.test.ts

@@ -1,7 +1,10 @@
 import { describe, expect, test } from "vitest";
 import { fileURLToPath } from "node:url";
 import { createPiExtensionHost } from "../index.js";
-import { readSubagentFixture, verifySubagentFixture } from "../subagent-fixture-test.js";
+import {
+  readSubagentFixture,
+  verifySubagentFixture,
+} from "../subagent-fixture-test.js";
 
 describe("@tintinweb/pi-subagents adapter", () => {
   test("exposes the background output file while the child is running", () => {
@@ -13,51 +16,105 @@ describe("@tintinweb/pi-subagents adapter", () => {
       result: {
         details: { agentId: "native-1", status: "background" },
         content: [
-          { type: "text", text: "Agent started in background.\nOutput file: /tmp/child.output\n" },
+          {
+            type: "text",
+            text: "Agent started in background.\nOutput file: /tmp/child.output\n",
+          },
         ],
       },
     });
     expect(mapping?.subagents).toEqual([
       expect.objectContaining({ id: "call-1", status: "running" }),
     ]);
-    expect(mapping?.childSessions).toEqual([{ id: "call-1", file: "/tmp/child.output" }]);
+    expect(mapping?.childSessions).toEqual([
+      { id: "call-1", file: "/tmp/child.output" },
+    ]);
   });
   test("maps captured foreground lifecycle live and on replay", async () => {
     const events = await verifySubagentFixture(
-      readSubagentFixture(new URL("./fixtures/foreground.json", import.meta.url)),
+      readSubagentFixture(
+        new URL("./fixtures/foreground.json", import.meta.url)
+      )
     );
     expect(
       events
         .filter((event) => event.event.type === "upsert")
-        .map((event) => (event.event.type === "upsert" ? event.event.status : null)),
+        .map((event) =>
+          event.event.type === "upsert" ? event.event.status : null
+        )
     ).toEqual(["running", "completed"]);
   });
+  // #5828: the extension writes a transcript for foreground agents too, but its
+  // foreground result carries no `Output file:` line, so the child opens empty.
+  test("exposes the foreground child's transcript when it completes", () => {
+    const fixture = readSubagentFixture(
+      new URL("./fixtures/foreground.json", import.meta.url)
+    );
+    const end = fixture.events.find(
+      (event) => event.type === "tool_execution_end"
+    ) as {
+      toolCallId: string;
+      result: Parameters<
+        ReturnType<typeof createPiExtensionHost>["mapToolCall"]
+      >[0]["result"];
+    };
+    const mapping = createPiExtensionHost().mapToolCall({
+      callId: end.toolCallId,
+      toolName: "Agent",
+      args: {
+        subagent_type: "general-purpose",
+        prompt: "list the files in this empty workspace",
+      },
+      status: "completed",
+      result: end.result,
+    });
+    expect(mapping?.subagents).toEqual([
+      expect.objectContaining({ id: end.toolCallId, status: "completed" }),
+    ]);
+    expect(mapping?.childSessions).toEqual([
+      { id: end.toolCallId, file: expect.any(String) },
+    ]);
+  });
   test("uses a structured notification to complete a background child", async () => {
-    const source = readSubagentFixture(new URL("./fixtures/background.json", import.meta.url));
+    const source = readSubagentFixture(
+      new URL("./fixtures/background.json", import.meta.url)
+    );
     const file = (
       source.messages.find((message) => message.role === "custom") as {
         details: { outputFile: string };
       }
     ).details.outputFile;
-    const fixture = readSubagentFixture(new URL("./fixtures/background.json", import.meta.url), {
-      from: file,
-      to: fileURLToPath(new URL("./fixtures/child-session.jsonl", import.meta.url)),
-    });
+    const fixture = readSubagentFixture(
+      new URL("./fixtures/background.json", import.meta.url),
+      {
+        from: file,
+        to: fileURLToPath(
+          new URL("./fixtures/child-session.jsonl", import.meta.url)
+        ),
+      }
+    );
     const events = await verifySubagentFixture(fixture);
     expect(
       events
         .filter((event) => event.event.type === "upsert")
-        .map((event) => (event.event.type === "upsert" ? event.event.status : null)),
+        .map((event) =>
+          event.event.type === "upsert" ? event.event.status : null
+        )
     ).toEqual(["running", "running", "completed"]);
-    expect(events.filter((event) => event.event.type === "timeline").length).toBeGreaterThan(0);
+    expect(
+      events.filter((event) => event.event.type === "timeline").length
+    ).toBeGreaterThan(0);
   });
   test("completes every background child in a grouped notification", async () => {
     const events = await verifySubagentFixture(
-      readSubagentFixture(new URL("./fixtures/background-group.json", import.meta.url)),
+      readSubagentFixture(
+        new URL("./fixtures/background-group.json", import.meta.url)
+      )
     );
     const finalStatus = new Map<string, string>();
     for (const { event } of events) {
-      if (event.type === "upsert" && event.status) finalStatus.set(event.id, event.status);
+      if (event.type === "upsert" && event.status)
+        finalStatus.set(event.id, event.status);
     }
     expect(Object.fromEntries(finalStatus)).toEqual({
       call_277173: "completed",
@@ -73,7 +130,7 @@ describe("@tintinweb/pi-subagents adapter", () => {
         args: { prompt: "foo" },
         status: "completed",
         result: { details: { agentId: "other", status: "completed" } },
-      }),
+      })
     ).toBeUndefined();
   });
 });