fix: prevent duplicate DM notifications for multi-keyword matches

Coordinates respondToMention and notifyNameMention so only one DM is
sent per message, regardless of how many keyword patterns are triggered.

src/events/handleMessageCreate.ts

@@ -29,6 +29,8 @@ export const handleMessageCreate = async(
     amari.recentlyActiveChannels.add(message.channel.id);
   }
   await updateMentorshipThread(amari, message);
-  await respondToMention(amari, message);
+  const mentionNotified = await respondToMention(amari, message);
-  await notifyNameMention(amari, message);
+  if (!mentionNotified) {
+    await notifyNameMention(amari, message);
+  }
 };

src/modules/respondToMention.ts

@@ -15,21 +15,22 @@ import type { Amari } from "../interfaces/amari.js";
  * If so, responds.
  * @param amari -- Amari's instance.
  * @param message -- The guild message payload from Discord.
+ * @returns Whether a DM notification was sent.
  */
 // eslint-disable-next-line complexity --  Mainly those reply options...
 export const respondToMention = async(
   amari: Amari,
   message: Message<true>,
-): Promise<void> => {
+): Promise<boolean> => {
   try {
     const naomi = amari.discord.users.cache.get(ids.users.naomi)
       ?? await amari.discord.users.fetch(ids.users.naomi);
     const { mentions, content, author, url, channel } = message;
     if (author.bot || author.id === ids.users.naomi) {
-      return;
+      return false;
     }
     if (amari.recentlyActiveChannels.has(channel.id)) {
-      return;
+      return false;
     }
     const mentionsNaomi = mentions.has(ids.users.naomi, {
       ignoreEveryone:    true,
@@ -45,7 +46,7 @@ export const respondToMention = async(
       ignoreRoles:       true,
     }) || /nhcarrigan/i.test(content);
     if (!mentionsNaomi && !mentionsNHCarrigan) {
-      return;
+      return false;
     }
     await naomi.send(
       {
@@ -56,9 +57,11 @@ export const respondToMention = async(
     await logger.metric("processed_mention", 1, { pingType: mentionsNaomi
       ? "naomi"
       : "nhcarrigan", user: author.id });
+    return true;
   } catch (error) {
     if (error instanceof Error) {
       await logger.error("respond to mention module", error);
     }
+    return false;
   }
 };