fix(scheduling-webui): submit participant revisions

webui/tests/scheduling-view-model.test.ts

@@ -70,6 +70,7 @@ test("maps visible account and contact selections into bounded scheduling partic
 test("reconstructs saved directory selections and preserves existing reconciliation identity", () => {
   const responseParticipant = {
     id: "stored-participant",
+    revision: "a".repeat(64),
     is_current_participant: false,
     respondent_id: "account-2",
     display_name: "Ada Account",
@@ -95,6 +96,7 @@ test("reconstructs saved directory selections and preserves existing reconciliat
   assert.equal(draft.sourceId, "stored-participant");
   assert.equal(draft.identityLocked, true);
   assert.equal(participantPayload(draft).id, "stored-participant");
+  assert.equal(participantPayload(draft).revision, "a".repeat(64));
 });
 
 const now = new Date("2026-07-20T10:00:00Z");