fix: tidy iMessage/Signal sender envelopes (#1080) - thanks @tyler6204

Co-authored-by: Tyler Yust <TYTYYUST@YAHOO.COM>

src/auto-reply/reply/inbound-sender-meta.ts

@@ -33,7 +33,8 @@ function hasSenderMetaLine(body: string, ctx: MsgContext): boolean {
   if (candidates.length === 0) return false;
   return candidates.some((candidate) => {
     const escaped = escapeRegExp(candidate);
-    // Check for sender at start of line OR after envelope header bracket
+    // Envelope bodies look like "[Signal ...] Alice: hi".
+    // Treat the post-header sender prefix as already having sender metadata.
     const pattern = new RegExp(`(^|\\n|\\]\\s*)${escaped}:\\s`, "i");
     return pattern.test(body);
   });

src/imessage/monitor/monitor-provider.ts

@@ -383,8 +383,8 @@ export async function monitorIMessageProvider(opts: MonitorIMessageOpts = {}): P
     }
 
     const chatTarget = formatIMessageChatTarget(chatId);
-    // For groups: use chat name or just "Group" (channel "iMessage" is already shown)
-    // For DMs: show sender, only add id: suffix if raw differs from normalized
+    // For groups: use chat name or just "Group" (channel "iMessage" is already shown).
+    // For DMs: keep headers compact; only add id: suffix if raw differs from normalized.
     const fromLabel = isGroup
       ? `${message.chat_name || "Group"} id:${chatId ?? "unknown"}`
       : senderNormalized === sender

src/signal/monitor/event-handler.ts

@@ -65,8 +65,8 @@ export function createSignalEventHandler(deps: SignalEventHandlerDeps) {
   };
 
   async function handleSignalInboundMessage(entry: SignalInboundEntry) {
-    // For groups: use group name or just "Group" (channel "Signal" is already shown)
-    // For DMs: show sender, only add id: suffix if display differs from name
+    // For groups: use group name or just "Group" (channel "Signal" is already shown).
+    // For DMs: keep headers compact; only add id: suffix if display differs from name.
     const fromLabel = entry.isGroup
       ? `${entry.groupName || "Group"} id:${entry.groupId}`
       : entry.senderName === entry.senderDisplay