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

CLAUDE.md

@@ -1,25 +1,41 @@
-# NanoClaw
+# Regolith
 
-Personal Claude assistant. See [README.md](README.md) for philosophy and setup. See [docs/REQUIREMENTS.md](docs/REQUIREMENTS.md) for architecture decisions.
+Personal AI assistant with multi-channel support (WhatsApp + Discord) and multi-runtime backends (Claude Agent SDK + OpenCode). See [README.md](README.md) for setup.
 
 ## Quick Context
 
-Single Node.js process that connects to WhatsApp, routes messages to Claude Agent SDK running in Apple Container (Linux VMs). Each group has isolated filesystem and memory.
+Single Node.js process that connects to WhatsApp and/or Discord, routes messages to Claude Agent SDK (in containers) or OpenCode runtime. Each group has isolated filesystem and memory.
 
 ## Key Files
 
 | File | Purpose |
 |------|---------|
-| `src/index.ts` | Orchestrator: state, message loop, agent invocation |
+| `src/index.ts` | Orchestrator: multi-channel setup, state, message loop, agent invocation |
 | `src/channels/whatsapp.ts` | WhatsApp connection, auth, send/receive |
-| `src/ipc.ts` | IPC watcher and task processing |
-| `src/router.ts` | Message formatting and outbound routing |
-| `src/config.ts` | Trigger pattern, paths, intervals |
+| `src/channels/discord.ts` | Discord bot connection, mention handling, attachments, reply context |
+| `src/channels/chunk-text.ts` | Message chunking (2000-char Discord limit) |
+| `src/router.ts` | Message formatting, outbound routing, `findChannel` |
+| `src/config.ts` | Trigger pattern, paths, intervals, Discord/OpenCode config |
+| `src/opencode/runtime.ts` | OpenCode AI backend (CLI + SDK modes) |
+| `src/opencode/session-store.ts` | SQLite session persistence for OpenCode |
+| `src/opencode/live-sessions.ts` | In-memory session manager with idle cleanup |
+| `src/opencode/types.ts` | OpenCode type definitions |
 | `src/container-runner.ts` | Spawns agent containers with mounts |
 | `src/task-scheduler.ts` | Runs scheduled tasks |
 | `src/db.ts` | SQLite operations |
 | `groups/{name}/CLAUDE.md` | Per-group memory (isolated) |
-| `container/skills/agent-browser.md` | Browser automation tool (available to all agents via Bash) |
+
+## Configuration
+
+| Variable | Default | Purpose |
+|----------|---------|---------|
+| `ASSISTANT_NAME` | Andy | Trigger word for the bot |
+| `DISCORD_BOT_TOKEN` | (empty) | Discord bot token; set to enable Discord |
+| `DISCORD_ONLY` | false | Skip WhatsApp when true |
+| `OPENCODE_MODE` | cli | OpenCode mode: "cli" or "sdk" |
+| `OPENCODE_MODEL` | (unset) | Model name for OpenCode |
+| `OPENCODE_TIMEOUT` | 120 | Timeout in seconds |
+| `OPENCODE_SESSION_TTL_HOURS` | 24 | Session TTL in hours |
 
 ## Skills
 
@@ -31,27 +47,9 @@ Single Node.js process that connects to WhatsApp, routes messages to Claude Agen
 
 ## Development
 
-Run commands directly—don't tell the user to run them.
-
 ```bash
 npm run dev          # Run with hot reload
 npm run build        # Compile TypeScript
-./container/build.sh # Rebuild agent container
+npm test             # Run tests
+npm run typecheck    # Type check without emitting
 ```
-
-Service management:
-```bash
-launchctl load ~/Library/LaunchAgents/com.nanoclaw.plist
-launchctl unload ~/Library/LaunchAgents/com.nanoclaw.plist
-```
-
-## Container Build Cache
-
-Apple Container's buildkit caches the build context aggressively. `--no-cache` alone does NOT invalidate COPY steps — the builder's volume retains stale files. To force a truly clean rebuild:
-
-```bash
-container builder stop && container builder rm && container builder start
-./container/build.sh
-```
-
-Always verify after rebuild: `container run -i --rm --entrypoint wc nanoclaw-agent:latest -l /app/src/index.ts`