test: stub image provider discovery in generation tool tests

src/agents/pi-embedded-runner.compaction-safety-timeout.test.ts

@@ -1,4 +1,4 @@
-import { afterEach, describe, expect, it, vi } from "vitest";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import {
   compactWithSafetyTimeout,
   EMBEDDED_COMPACTION_TIMEOUT_MS,
@@ -6,7 +6,13 @@ import {
 } from "./pi-embedded-runner/compaction-safety-timeout.js";
 
 describe("compactWithSafetyTimeout", () => {
+  beforeEach(() => {
+    vi.useRealTimers();
+    vi.clearAllTimers();
+  });
+
   afterEach(() => {
+    vi.clearAllTimers();
     vi.useRealTimers();
   });
 

src/agents/tools/image-generate-tool.test.ts

@@ -564,6 +564,7 @@ describe("createImageGenerateTool", () => {
   });
 
   it("ignores non-finite mediaMaxMb when loading reference images", async () => {
+    stubImageGenerationProviders();
     stubEditedImageFlow({ width: 3200, height: 1800 });
     const tool = requireImageGenerateTool(
       createImageGenerateTool({