fix: address coordinate review findings

Issue: #224
User-Visible: no

src/serialized-write-queue.ts

@@ -0,0 +1,11 @@
+/**
+ * Append one write to a promise chain without letting an earlier rejection
+ * poison later edits. The callback is deliberately invoked only when its turn
+ * starts, so it can read the latest local state at that moment.
+ */
+export function enqueueSerializedWrite(
+  previous: Promise<void>,
+  write: () => Promise<void>,
+): Promise<void> {
+  return previous.catch(() => undefined).then(write);
+}