fix(hooks): add isGroup and groupId to message:sent context

Adds group context fields to MessageSentHookContext so hooks can
correlate sent events with received events for the same conversation.

Previously, message:received included isGroup/groupId but message:sent
did not, forcing hooks to use mismatched identifiers (e.g. groupId vs
numeric chat ID) when tracking conversations.

Fields are derived from MsgContext in dispatch-from-config and threaded
through route-reply and deliver via the mirror parameter.

Addresses feedback from matskevich (production user, 550+ events)
reported on PR #6797.

src/auto-reply/reply/route-reply.ts

@@ -37,6 +37,10 @@ export type RouteReplyParams = {
   abortSignal?: AbortSignal;
   /** Mirror reply into session transcript (default: true when sessionKey is set). */
   mirror?: boolean;
+  /** Whether this message is being sent in a group/channel context */
+  isGroup?: boolean;
+  /** Group or channel identifier for correlation with received events */
+  groupId?: string;
 };
 
 export type RouteReplyResult = {
@@ -145,6 +149,8 @@ export async function routeReply(params: RouteReplyParams): Promise<RouteReplyRe
               agentId: resolvedAgentId,
               text,
               mediaUrls,
+              ...(params.isGroup != null ? { isGroup: params.isGroup } : {}),
+              ...(params.groupId ? { groupId: params.groupId } : {}),
             }
           : undefined,
     });