feat: add Discord channel, OpenCode runtime, rename to Regolith

- Discord channel integration (discord.js) with mention stripping, attachment tagging, reply context, message chunking
- OpenCode runtime with CLI and SDK modes, SQLite session persistence, idle timeout cleanup
- Multi-channel architecture: WhatsApp + Discord simultaneous or independent via DISCORD_ONLY/DISCORD_BOT_TOKEN
- Config additions: DISCORD_BOT_TOKEN, DISCORD_ONLY, OPENCODE_MODE, OPENCODE_MODEL, OPENCODE_TIMEOUT, OPENCODE_SESSION_TTL_HOURS
- Updated README and CLAUDE.md documentation
- Renamed project to Regolith in package.json

src/index.ts

@@ -5,11 +5,14 @@ import path from 'path';
 import {
   ASSISTANT_NAME,
   DATA_DIR,
+  DISCORD_BOT_TOKEN,
+  DISCORD_ONLY,
   IDLE_TIMEOUT,
   MAIN_GROUP_FOLDER,
   POLL_INTERVAL,
   TRIGGER_PATTERN,
 } from './config.js';
+import { DiscordChannel } from './channels/discord.js';
 import { WhatsAppChannel } from './channels/whatsapp.js';
 import {
   ContainerOutput,
@@ -485,9 +488,17 @@ async function main(): Promise<void> {
   };
 
   // Create and connect channels
-  whatsapp = new WhatsAppChannel(channelOpts);
-  channels.push(whatsapp);
-  await whatsapp.connect();
+  if (DISCORD_BOT_TOKEN) {
+    const discord = new DiscordChannel(DISCORD_BOT_TOKEN, channelOpts);
+    channels.push(discord);
+    await discord.connect();
+  }
+
+  if (!DISCORD_ONLY) {
+    whatsapp = new WhatsAppChannel(channelOpts);
+    channels.push(whatsapp);
+    await whatsapp.connect();
+  }
 
   // Start subsystems (independently of connection handler)
   startSchedulerLoop({
@@ -497,10 +508,7 @@ async function main(): Promise<void> {
     onProcess: (groupJid, proc, containerName, groupFolder) => queue.registerProcess(groupJid, proc, containerName, groupFolder),
     sendMessage: async (jid, rawText) => {
       const channel = findChannel(channels, jid);
-      if (!channel) {
-        console.log(`Warning: no channel owns JID ${jid}, cannot send message`);
-        return;
-      }
+      if (!channel) return;
       const text = formatOutbound(rawText);
       if (text) await channel.sendMessage(jid, text);
     },