test(regression): cover recent landed fix paths

src/agents/model-fallback.test.ts

@@ -518,6 +518,35 @@ describe("runWithModelFallback", () => {
     }
   });
 
+  it("sanitizes model identifiers in model_not_found warnings", async () => {
+    setLoggerOverride({ level: "silent", consoleLevel: "warn" });
+    const warnSpy = vi.spyOn(console, "warn").mockImplementation(() => {});
+    try {
+      const cfg = makeCfg();
+      const run = vi
+        .fn()
+        .mockRejectedValueOnce(new Error("Model not found: openai/gpt-6"))
+        .mockResolvedValueOnce("ok");
+
+      const result = await runWithModelFallback({
+        cfg,
+        provider: "openai",
+        model: "gpt-6\u001B[31m\nspoof",
+        run,
+      });
+
+      expect(result.result).toBe("ok");
+      const warning = warnSpy.mock.calls[0]?.[0] as string;
+      expect(warning).toContain('Model "openai/gpt-6spoof" not found');
+      expect(warning).not.toContain("\u001B");
+      expect(warning).not.toContain("\n");
+    } finally {
+      warnSpy.mockRestore();
+      setLoggerOverride(null);
+      resetLogger();
+    }
+  });
+
   it("skips providers when all profiles are in cooldown", async () => {
     await expectSkippedUnavailableProvider({
       providerPrefix: "cooldown-test",