fix(utils): guard resolveUserPath for missing workspace input

src/utils.test.ts

@@ -240,4 +240,9 @@ describe("resolveUserPath", () => {
     expect(resolveUserPath("")).toBe("");
     expect(resolveUserPath("   ")).toBe("");
   });
+
+  it("returns empty string for undefined/null input", () => {
+    expect(resolveUserPath(undefined as unknown as string)).toBe("");
+    expect(resolveUserPath(null as unknown as string)).toBe("");
+  });
 });