feat: moderator bot presence via Discord Gateway

Use Node.js built-in WebSocket to maintain a minimal Discord Gateway
connection for the moderator bot, keeping it 'online' with a
'Watching Moderating' status. Handles heartbeat, reconnect, and resume.

Also fix package-plugin.mjs to include moderator-presence.ts in dist.

plugin/index.ts

@@ -3,6 +3,7 @@ import path from "node:path";
 import type { OpenClawPluginApi } from "openclaw/plugin-sdk";
 import { evaluateDecision, resolvePolicy, type ChannelPolicy, type Decision, type WhisperGateConfig } from "./rules.js";
 import { checkTurn, advanceTurn, resetTurn, onNewMessage, onSpeakerDone, initTurnOrder, getTurnDebugInfo } from "./turn-manager.js";
+import { startModeratorPresence, stopModeratorPresence } from "./moderator-presence.js";
 
 type DiscordControlAction = "channel-private-create" | "channel-private-update" | "member-list";
 
@@ -367,6 +368,12 @@ export default {
     const liveAtRegister = getLivePluginConfig(api, baseConfig as WhisperGateConfig);
     ensurePolicyStateLoaded(api, liveAtRegister);
 
+    // Start moderator bot presence (keep it "online" on Discord)
+    if (liveAtRegister.moderatorBotToken) {
+      startModeratorPresence(liveAtRegister.moderatorBotToken, api.logger);
+      api.logger.info("whispergate: moderator bot presence starting");
+    }
+
     api.registerTool(
       {
         name: "whispergate_tools",