fix: include sender info for iMessage/Signal group messages

src/auto-reply/reply/dispatch-from-config.ts

@@ -22,6 +22,8 @@ export async function dispatchReplyFromConfig(params: {
 }): Promise<DispatchFromConfigResult> {
   const { ctx, cfg, dispatcher } = params;
 
+  maybeAppendSenderMeta(ctx);
+
   if (shouldSkipDuplicateInbound(ctx)) {
     return { queuedFinal: false, counts: dispatcher.getQueuedCounts() };
   }
@@ -160,3 +162,40 @@ export async function dispatchReplyFromConfig(params: {
   counts.final += routedFinalCount;
   return { queuedFinal, counts };
 }
+
+function maybeAppendSenderMeta(ctx: MsgContext): void {
+  if (!ctx.Body?.trim()) return;
+  if (ctx.ChatType !== "group") return;
+  if (!shouldInjectSenderMeta(ctx)) return;
+  if (hasSenderMetaLine(ctx.Body)) return;
+
+  const senderLabel = formatSenderLabel(ctx);
+  if (!senderLabel) return;
+
+  const lineBreak = resolveBodyLineBreak(ctx.Body);
+  ctx.Body = `${ctx.Body}${lineBreak}[from: ${senderLabel}]`;
+}
+
+function shouldInjectSenderMeta(ctx: MsgContext): boolean {
+  const origin = (ctx.OriginatingChannel ?? ctx.Provider ?? "").toLowerCase();
+  return origin === "imessage" || origin === "signal";
+}
+
+function resolveBodyLineBreak(body: string): string {
+  if (body.includes("\n")) return "\n";
+  if (body.includes("\\n")) return "\\n";
+  return "\n";
+}
+
+function hasSenderMetaLine(body: string): boolean {
+  return /(^|\n|\\n)\[from:/i.test(body);
+}
+
+function formatSenderLabel(ctx: MsgContext): string | null {
+  const senderName = ctx.SenderName?.trim();
+  const senderId = ctx.SenderId?.trim();
+  if (senderName && senderId && senderName !== senderId) {
+    return `${senderName} (${senderId})`;
+  }
+  return senderName ?? senderId ?? null;
+}