refactor: centralize outbound policy + target schema

src/infra/outbound/channel-target.ts

@@ -0,0 +1,9 @@
+export const CHANNEL_TARGET_DESCRIPTION =
+  "Recipient/channel: E.164 for WhatsApp/Signal, Telegram chat id/@username, Discord/Slack channel/user, or iMessage handle/chat_id";
+
+export const CHANNEL_TARGETS_DESCRIPTION =
+  "Recipient/channel targets (same format as --to); accepts ids or names when the directory is available.";
+
+export function normalizeChannelTargetInput(raw: string): string {
+  return raw.trim();
+}