Atomically update cached values file

tools/utils/atomic-write.go

@@ -24,6 +24,7 @@ func AtomicWriteFile(path string, data []byte, perm os.FileMode) (err error) {
 					f.Close()
 					if !removed {
 						os.Remove(f.Name())
+						removed = true
 					}
 				}()
 				_, err = f.Write(data)

tools/utils/cached_values.go

@@ -31,7 +31,7 @@ func (self *CachedValues[T]) Load() T {
 func (self *CachedValues[T]) Save() {
 	raw, err := json.Marshal(self.Opts)
 	if err == nil {
-		os.WriteFile(self.Path(), raw, 0600)
+		AtomicUpdateFile(self.Path(), raw, 0o600)
 	}
 }