diff --git a/test/debug-mock-tracking.test.ts b/test/debug-mock-tracking.test.ts
deleted file mode 100644
index 7a7aca8..0000000
--- a/test/debug-mock-tracking.test.ts
+++ /dev/null
@@ -1,154 +0,0 @@
-/**
- * Diagnostic test file to debug mock tracking failures on Forgejo CI.
- * Tests pass locally (macOS + Docker grunt-runner) but image-downloader
- * tests fail on the actual Forgejo runner. This file isolates mock/spy
- * tracking behavior to find the exact failure point.
- *
- * DELETE THIS FILE once the root cause is found and fixed.
- */
-import {
-  describe,
-  test,
-  expect,
-  spyOn,
-  mock,
-  beforeEach,
-  afterEach,
-} from "bun:test";
-
-describe("DEBUG: mock tracking diagnostics", () => {
-  test("basic mock() tracks calls", () => {
-    const fn = mock(() => 42);
-    fn("hello");
-    console.log("[DIAG] mock.calls:", JSON.stringify(fn.mock.calls));
-    expect(fn).toHaveBeenCalledWith("hello");
-    expect(fn).toHaveBeenCalledTimes(1);
-  });
-
-  test("mock() tracks calls through object property", () => {
-    const obj = { method: mock(() => "ok") };
-    obj.method("arg1", "arg2");
-    console.log(
-      "[DIAG] obj.method.mock.calls:",
-      JSON.stringify(obj.method.mock.calls),
-    );
-    expect(obj.method).toHaveBeenCalledWith("arg1", "arg2");
-  });
-
-  test("mock() tracks calls after destructuring", () => {
-    const fn = mock(() => Promise.resolve("done"));
-    const obj = { fn };
-    const { fn: extracted } = obj;
-    extracted("test");
-    console.log(
-      "[DIAG] destructured mock.calls:",
-      JSON.stringify(fn.mock.calls),
-    );
-    expect(fn).toHaveBeenCalledWith("test");
-  });
-
-  test("mock() tracks calls when passed as parameter", async () => {
-    const mockFn = mock(() => Promise.resolve(undefined));
-    const deps = { action: mockFn as (...args: unknown[]) => Promise<void> };
-
-    async function doWork(d: {
-      action: (...args: unknown[]) => Promise<void>;
-    }) {
-      const { action } = d;
-      await action("path", { recursive: true });
-    }
-
-    await doWork(deps);
-    console.log(
-      "[DIAG] param-passed mock.calls:",
-      JSON.stringify(mockFn.mock.calls),
-    );
-    expect(mockFn).toHaveBeenCalledWith("path", { recursive: true });
-  });
-
-  test("spyOn(console) tracks calls", () => {
-    const spy = spyOn(console, "warn").mockImplementation(() => {});
-    console.warn("test warning");
-    // Check raw calls before expect
-    console.log(
-      "[DIAG] console.warn spy.mock.calls:",
-      JSON.stringify(spy.mock.calls),
-    );
-    expect(spy).toHaveBeenCalledWith("test warning");
-    spy.mockRestore();
-  });
-
-  test("spyOn(global, 'fetch') tracks calls", async () => {
-    const fetchSpy = spyOn(global, "fetch").mockResolvedValue({
-      ok: true,
-      arrayBuffer: async () => new ArrayBuffer(0),
-    } as Response);
-    await fetch("https://example.com");
-    console.log(
-      "[DIAG] fetch spy.mock.calls:",
-      JSON.stringify(fetchSpy.mock.calls),
-    );
-    expect(fetchSpy).toHaveBeenCalledWith("https://example.com");
-    fetchSpy.mockRestore();
-  });
-
-  test("mock() with mockClear preserves tracking", () => {
-    const fn = mock(() => "first");
-    fn("before-clear");
-    fn.mockClear();
-    fn("after-clear");
-    console.log(
-      "[DIAG] after mockClear, calls:",
-      JSON.stringify(fn.mock.calls),
-    );
-    expect(fn).toHaveBeenCalledTimes(1);
-    expect(fn).toHaveBeenCalledWith("after-clear");
-  });
-
-  describe("mock created at describe scope", () => {
-    const describeMock = mock(() => Promise.resolve(undefined as any));
-
-    beforeEach(() => {
-      describeMock.mockClear();
-    });
-
-    test("tracks calls from describe-scoped mock", async () => {
-      await describeMock("test-arg");
-      console.log(
-        "[DIAG] describe-scope mock.calls:",
-        JSON.stringify(describeMock.mock.calls),
-      );
-      expect(describeMock).toHaveBeenCalledWith("test-arg");
-    });
-
-    test("tracks calls via DI pattern (like image-downloader)", async () => {
-      const deps = {
-        mkdir: describeMock as any,
-      };
-
-      // Simulate the exact pattern from image-downloader.ts
-      const { mkdir } = deps;
-      await mkdir("/tmp/github-images", { recursive: true });
-
-      console.log(
-        "[DIAG] DI-pattern mock.calls:",
-        JSON.stringify(describeMock.mock.calls),
-      );
-      expect(describeMock).toHaveBeenCalledWith("/tmp/github-images", {
-        recursive: true,
-      });
-    });
-  });
-
-  describe("env var diagnostics", () => {
-    test("GITHUB_SERVER_URL value", () => {
-      console.log("[DIAG] GITHUB_SERVER_URL:", process.env.GITHUB_SERVER_URL);
-      console.log("[DIAG] FORGEJO:", process.env.FORGEJO);
-      console.log("[DIAG] RUNNER_OS:", process.env.RUNNER_OS);
-      console.log("[DIAG] Bun.version:", Bun.version);
-      console.log("[DIAG] process.arch:", process.arch);
-      console.log("[DIAG] process.platform:", process.platform);
-      expect(true).toBe(true);
-    });
-  });
-});