Remove workspace state subsystem

internal/fileutil/fileutil_test.go

@@ -80,24 +80,3 @@ func TestWriteJSONAtomic(t *testing.T) {
 		t.Fatalf("json = %q, want indented object", data)
 	}
 }
-
-func TestCopyFileAtomic(t *testing.T) {
-	dir := t.TempDir()
-	source := filepath.Join(dir, "source.txt")
-	target := filepath.Join(dir, "nested", "target.txt")
-	if err := os.WriteFile(source, []byte("copied"), 0o600); err != nil {
-		t.Fatalf("WriteFile() error = %v", err)
-	}
-
-	if err := CopyFileAtomic(source, target); err != nil {
-		t.Fatalf("CopyFileAtomic() error = %v", err)
-	}
-
-	data, err := os.ReadFile(target)
-	if err != nil {
-		t.Fatalf("ReadFile() error = %v", err)
-	}
-	if string(data) != "copied" {
-		t.Fatalf("data = %q, want copied", data)
-	}
-}