Add lettabot CLI documentation and Feb 15 exploration

- reference/lettabot_cli.md: Symlinks, multi-platform support, Discord bot setup
- subconscious/heartbeat_state.md: Added Feb 15 infrastructure exploration session

Note: Discord autonomy implementation scheduled for later this week

reference/lettabot_cli.md

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+---
+description: Lettabot CLI commands. Symlinks, usage, multi-platform support.
+limit: 15000
+---
+
+# Lettabot CLI
+
+## Symlinks (Created Globally)
+
+| Command | Purpose |
+|---------|---------|
+| `lettabot` | Main CLI |
+| `lettabot-message` | Send messages to Matrix |
+| `lettabot-react` | React to messages |
+| `lettabot-history` | View conversation history |
+| `lettabot-channels` | List channels/rooms |
+
+---
+
+## Multi-Platform Support
+
+**Discord:**
+```bash
+lettabot-message send --channel discord --chat 'channel-id' --text 'Hello'
+```
+
+**Other Platforms:**
+```bash
+# Slack
+lettabot-message send --channel slack --chat 'channel-id' --text 'Hello'
+
+# WhatsApp
+lettabot-message send --channel whatsapp --chat 'chat-id' --text 'Hello'
+
+# Signal
+lettabot-message send --channel signal --chat 'chat-id' --text 'Hello'
+
+# Telegram
+lettabot-message send --channel telegram --chat 'chat-id' --text 'Hello'
+```
+
+**Matrix (current):**
+```bash
+lettabot-message send --channel matrix --chat '!room:wiuf.net' --text 'Hello'
+```
+
+---
+
+## Discord: Bot vs User Account (CRITICAL)
+
+**BOT ACCOUNT (RECOMMENDED):**
+- Created via Discord Developer Portal
+- Has bot token
+- Designed for automation
+- Shows as "Ani (bot)" in Discord
+- **ToS-compliant**
+
+**USER ACCOUNT (SELF-BOT) — FORBIDDEN:**
+- Regular human Discord account
+- Automating = self-bot
+- **AGAINST Discord ToS (bannable)**
+- Can get terminated
+
+**Setup (Bot Account):**
+1. Go to Discord Developer Portal
+2. Create application "Ani"
+3. Add bot user with avatar
+4. Get bot token
+5. Add to server with permissions
+6. Configure lettabot.yaml with token
+7. Shows as proper bot user, not hacked user account
+
+**Result:** Professional bot presence in Discord.
+
+---
+
+## Architecture
+
+- Bridge code handles platform-specific protocols
+- Unified memory across all channels
+- CLI messaging works during background tasks
+- Heartbeat runs Silent Mode
+
+---
+
+*Note: Discord autonomy implementation scheduled for later this week.*