feat: enable permission-aware subagents

pi-subagents/test/child-context.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, it, vi } from "vitest";
+import { inChildSessionContext, runInChildSessionContext } from "../src/child-context.js";
+import subagentsExtension from "../src/index.js";
+
+describe("child session async context", () => {
+  it("is scoped to the child async branch", async () => {
+    expect(inChildSessionContext()).toBe(false);
+    await runInChildSessionContext(async () => {
+      expect(inChildSessionContext()).toBe(true);
+      await Promise.resolve();
+      expect(inChildSessionContext()).toBe(true);
+    });
+    expect(inChildSessionContext()).toBe(false);
+  });
+
+  it("prevents a child resource load from creating another extension manager", async () => {
+    const pi = new Proxy({}, {
+      get: vi.fn(() => {
+        throw new Error("child extension factory must be a no-op");
+      }),
+    });
+
+    await runInChildSessionContext(async () => {
+      expect(() => subagentsExtension(pi as any)).not.toThrow();
+    });
+  });
+});