feat(discord): add configurable presence (activity/status/type)

- Adds `activity`, `status`, `activityType`, and `activityUrl` to Discord provider config schema.
- Implements a `ReadyListener` in `DiscordProvider` to apply these settings on connection.
- Solves the issue where `@buape/carbon` ignores initial presence options in constructor.
- Validated manually and via existing test suite.

src/discord/monitor/provider.ts

@@ -1,4 +1,4 @@
-import { Client, type BaseMessageInteractiveComponent } from "@buape/carbon";
+import { Client, ReadyListener, type BaseMessageInteractiveComponent } from "@buape/carbon";
 import { GatewayIntents, GatewayPlugin } from "@buape/carbon/gateway";
 import { Routes } from "discord-api-types/v10";
 import { HttpsProxyAgent } from "https-proxy-agent";
@@ -40,6 +40,7 @@ import {
   registerDiscordListener,
 } from "./listeners.js";
 import { createDiscordMessageHandler } from "./message-handler.js";
+import { resolveDiscordPresenceUpdate } from "./presence.js";
 import {
   createDiscordCommandArgFallbackButton,
   createDiscordNativeCommand,
@@ -557,6 +558,22 @@ export async function monitorDiscordProvider(opts: MonitorDiscordOpts = {}) {
     );
   }
 
+  class DiscordStatusReadyListener extends ReadyListener {
+    async handle(_data: unknown, client: Client) {
+      const gateway = client.getPlugin<GatewayPlugin>("gateway");
+      if (!gateway) {
+        return;
+      }
+
+      const presence = resolveDiscordPresenceUpdate(discordCfg);
+      if (!presence) {
+        return;
+      }
+
+      gateway.updatePresence(presence);
+    }
+  }
+
   const client = new Client(
     {
       baseUrl: "http://localhost",
@@ -568,7 +585,7 @@ export async function monitorDiscordProvider(opts: MonitorDiscordOpts = {}) {
     },
     {
       commands,
-      listeners: [],
+      listeners: [new DiscordStatusReadyListener()],
       components,
     },
     [createDiscordGatewayPlugin({ discordConfig: discordCfg, runtime })],