fix: migrate cron payload channel alias

src/cron/normalize.ts

@@ -32,6 +32,17 @@ function coercePayload(payload: UnknownRecord) {
     if (typeof payload.text === "string") next.kind = "systemEvent";
     else if (typeof payload.message === "string") next.kind = "agentTurn";
   }
+
+  // Back-compat: older configs used `channel` for delivery provider.
+  const providerRaw =
+    typeof payload.provider === "string" ? payload.provider.trim() : "";
+  const channelRaw =
+    typeof payload.channel === "string" ? payload.channel.trim() : "";
+  const provider =
+    (providerRaw || channelRaw).trim().toLowerCase() ||
+    (providerRaw || channelRaw).trim();
+  if (!providerRaw && provider) next.provider = provider;
+  if ("channel" in next) delete next.channel;
   return next;
 }