refactor: consolidate agent/editor plugins under integrations/ (#5491)

Co-authored-by: Claude <noreply@anthropic.com>

integrations/pi-agent-plugin/src/entry.test.ts

@@ -0,0 +1,34 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+import { resolveUserId } from "./entry.ts";
+
+describe("resolveUserId", () => {
+  const originalEnv = { ...process.env };
+
+  afterEach(() => {
+    process.env = { ...originalEnv };
+  });
+
+  it("returns config userId when set", () => {
+    expect(resolveUserId("config-user")).toBe("config-user");
+  });
+
+  it("falls back to USER env var", () => {
+    process.env.USER = "env-user";
+    delete process.env.USERNAME;
+    expect(resolveUserId("")).toBe("env-user");
+  });
+
+  it("falls back to USERNAME env var on Windows", () => {
+    delete process.env.USER;
+    process.env.USERNAME = "win-user";
+    expect(resolveUserId("")).toBe("win-user");
+  });
+
+  it("falls back to os.userInfo() when env vars are missing", () => {
+    delete process.env.USER;
+    delete process.env.USERNAME;
+    const result = resolveUserId("");
+    expect(typeof result).toBe("string");
+    expect(result.length).toBeGreaterThan(0);
+  });
+});