fix(discord): add media dedup production code for messaging tool pipeline

Wire media URL tracking through the embedded agent pipeline so that
media already sent via messaging tools is not delivered again by the
reply dispatcher.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/auto-reply/reply/agent-runner-payloads.ts

@@ -10,6 +10,7 @@ import { normalizeReplyPayloadDirectives } from "./reply-delivery.js";
 import {
   applyReplyThreading,
   filterMessagingToolDuplicates,
+  filterMessagingToolMediaDuplicates,
   isRenderablePayload,
   shouldSuppressMessagingToolReplies,
 } from "./reply-payloads.js";
@@ -27,6 +28,7 @@ export function buildReplyPayloads(params: {
   currentMessageId?: string;
   messageProvider?: string;
   messagingToolSentTexts?: string[];
+  messagingToolSentMediaUrls?: string[];
   messagingToolSentTargets?: Parameters<
     typeof shouldSuppressMessagingToolReplies
   >[0]["messagingToolSentTargets"];
@@ -93,16 +95,22 @@ export function buildReplyPayloads(params: {
     payloads: replyTaggedPayloads,
     sentTexts: messagingToolSentTexts,
   });
+  const mediaFilteredPayloads = filterMessagingToolMediaDuplicates({
+    payloads: dedupedPayloads,
+    sentMediaUrls: params.messagingToolSentMediaUrls ?? [],
+  });
   // Filter out payloads already sent via pipeline or directly during tool flush.
   const filteredPayloads = shouldDropFinalPayloads
     ? []
     : params.blockStreamingEnabled
-      ? dedupedPayloads.filter((payload) => !params.blockReplyPipeline?.hasSentPayload(payload))
+      ? mediaFilteredPayloads.filter(
+          (payload) => !params.blockReplyPipeline?.hasSentPayload(payload),
+        )
       : params.directlySentBlockKeys?.size
-        ? dedupedPayloads.filter(
+        ? mediaFilteredPayloads.filter(
             (payload) => !params.directlySentBlockKeys!.has(createBlockReplyPayloadKey(payload)),
           )
-        : dedupedPayloads;
+        : mediaFilteredPayloads;
   const replyPayloads = suppressMessagingToolReplies ? [] : filteredPayloads;
 
   return {