docs: add gateway restart guide

docs/gateway/restart.md

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+# Restarting the Clawdbot Gateway
+
+This guide covers how to properly restart the Clawdbot gateway service on different platforms.
+
+## Linux (systemd)
+
+The gateway runs as a systemd user service on Linux servers.
+
+### Quick Restart
+
+```bash
+systemctl --user restart clawdbot-gateway.service
+```
+
+### Full Reload (after code updates)
+
+When you update the codebase (git pull, rebase, etc.), follow these steps:
+
+```bash
+# 1. Stop the service
+systemctl --user stop clawdbot-gateway.service
+
+# 2. Kill any stray gateway processes
+pkill -f "gateway.*18789"
+
+# 3. Reload systemd configuration (if service file changed)
+systemctl --user daemon-reload
+
+# 4. Start the service
+systemctl --user start clawdbot-gateway.service
+
+# 5. Verify it's running
+systemctl --user status clawdbot-gateway.service
+```
+
+### Reinstall Service (after major updates)
+
+If the gateway command changed or you're having persistent issues:
+
+```bash
+# Uninstall old service
+pnpm clawdbot daemon uninstall
+
+# Reinstall with latest configuration
+pnpm clawdbot daemon install
+
+# Reload and start
+systemctl --user daemon-reload
+systemctl --user start clawdbot-gateway.service
+```
+
+### Check Logs
+
+```bash
+# Follow live logs
+journalctl --user -u clawdbot-gateway.service -f
+
+# View recent logs
+journalctl --user -u clawdbot-gateway.service -n 50
+
+# View logs since last boot
+journalctl --user -u clawdbot-gateway.service --boot
+```
+
+### Common Issues
+
+**Port already in use:**
+```bash
+# Find process using port 18789
+lsof -i :18789
+
+# Kill specific process
+kill -9 <PID>
+```
+
+**Service keeps restarting:**
+```bash
+# Check for error details
+journalctl --user -u clawdbot-gateway.service --since "5 minutes ago" | grep -i error
+
+# Verify service file is correct
+cat ~/.config/systemd/user/clawdbot-gateway.service
+```
+
+## macOS (launchd)
+
+Use the macOS menu app or restart script:
+
+```bash
+./scripts/restart-mac.sh
+```
+
+Or manually:
+
+```bash
+# Stop service
+launchctl unload ~/Library/LaunchAgents/dev.steipete.clawdbot.gateway.plist
+
+# Start service
+launchctl load ~/Library/LaunchAgents/dev.steipete.clawdbot.gateway.plist
+```
+
+## Using Clawdbot CLI
+
+Cross-platform daemon management:
+
+```bash
+# Stop gateway
+pnpm clawdbot daemon stop
+
+# Start gateway
+pnpm clawdbot daemon start
+
+# Check status
+pnpm clawdbot daemon status
+```
+
+## After Configuration Changes
+
+After modifying `~/.clawdbot/clawdbot.json` or auth profiles:
+
+```bash
+# Restart to reload configuration
+systemctl --user restart clawdbot-gateway.service
+
+# Or use CLI
+pnpm clawdbot daemon stop && pnpm clawdbot daemon start
+```
+
+The gateway will automatically reload:
+- Auth profiles
+- Model fallback configuration
+- Gateway settings (port, bind, etc.)
+- Provider configurations
+
+## Verifying Gateway Health
+
+```bash
+# Check gateway is responding
+pnpm clawdbot health
+
+# List auth providers
+pnpm clawdbot providers list
+
+# Test agent connection
+pnpm clawdbot agent --message "hello" --local
+```
+
+## Troubleshooting
+
+**Gateway won't start:**
+1. Check for port conflicts: `lsof -i :18789`
+2. Verify configuration: `pnpm clawdbot doctor`
+3. Check logs for errors
+4. Try reinstalling the service
+
+**Changes not taking effect:**
+- Configuration changes require restart
+- Code changes require rebuild: `pnpm build`
+- Service file changes require daemon-reload
+
+**Multiple gateways running:**
+```bash
+# List all gateway processes
+ps aux | grep gateway
+
+# Kill all gateway processes
+pkill -f "gateway.*18789"
+
+# Clean start
+systemctl --user stop clawdbot-gateway.service
+pkill -f "gateway.*18789"
+systemctl --user start clawdbot-gateway.service
+```