refactor: drop legacy session store keys

src/auto-reply/reply/inbound-context.ts

@@ -1,6 +1,7 @@
 import { normalizeChatType } from "../../channels/chat-type.js";
 import { resolveConversationLabel } from "../../channels/conversation-label.js";
 import type { MsgContext } from "../templating.js";
+import { formatInboundBodyWithSenderMeta } from "./inbound-sender-meta.js";
 import { normalizeInboundTextNewlines } from "./inbound-text.js";
 
 export type FinalizeInboundContextOptions = {
@@ -55,5 +56,13 @@ export function finalizeInboundContext<T extends Record<string, unknown>>(
     normalized.ConversationLabel = explicitLabel;
   }
 
+  // Ensure group/channel messages retain a sender meta line even when the body is a
+  // structured envelope (e.g. "[Signal ...] Alice: hi").
+  normalized.Body = formatInboundBodyWithSenderMeta({ ctx: normalized, body: normalized.Body });
+  normalized.BodyForAgent = formatInboundBodyWithSenderMeta({
+    ctx: normalized,
+    body: normalized.BodyForAgent,
+  });
+
   return normalized;
 }