Encode Automerge docs for Camino CRDT writes

test/crdt-automerge.test.ts

@@ -3,6 +3,8 @@ import test from "node:test";
 import * as Automerge from "@automerge/automerge";
 import {
   createAutomergeFieldValue,
+  encodeAutomergeFieldWrite,
+  isAutomergeFieldDoc,
   loadAutomergeFieldDoc,
   materializeAutomergeFieldValue,
   mergeAutomergeFieldValues,
@@ -21,6 +23,24 @@ test("Automerge CRDT fields lift plain values into stored envelopes", () => {
   });
 });
 
+test("Automerge CRDT fields encode rehydrated docs for writes", () => {
+  const base = loadAutomergeFieldDoc(
+    createAutomergeFieldValue({ title: "draft" }, type),
+    type,
+  );
+  const changed = Automerge.change(base, (doc) => {
+    (doc.value as { title: string }).title = "edited";
+  });
+
+  assert.equal(isAutomergeFieldDoc(changed), true);
+
+  const stored = encodeAutomergeFieldWrite(changed, type);
+
+  assert.deepEqual(materializeAutomergeFieldValue(stored, type), {
+    title: "edited",
+  });
+});
+
 test("Automerge CRDT fields merge divergent saved documents", () => {
   const base = loadAutomergeFieldDoc(
     createAutomergeFieldValue({ left: false, right: false }, type),