Initial ttyd skill

SKILL.md

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+---
+name: ttyd
+description: Share terminal over the web via WebSocket
+metadata:
+  version: "1.0.0"
+  vibestack:
+    main: false
+---
+
+# TTYD Skill
+
+Installs [ttyd](https://github.com/tsl0922/ttyd) - a simple command-line tool for sharing terminal over the web.
+
+## Features
+
+- Share any command-line program over the web
+- WebSocket-based, low latency
+- SSL/TLS support
+- Basic authentication
+- Customizable terminal options
+
+## Configuration
+
+### Environment Variables
+
+| Variable | Description | Default |
+|----------|-------------|---------|
+| `TTYD_PORT` | Port to listen on | `7681` |
+| `TTYD_COMMAND` | Command to run | `/bin/bash` |
+| `TTYD_CREDENTIAL` | Basic auth (user:pass) | (none) |
+| `TTYD_OPTIONS` | Additional ttyd options | (none) |
+
+## Usage
+
+### As a dependency
+
+```yaml
+metadata:
+  vibestack:
+    requires:
+      - ttyd
+```
+
+### Standalone
+
+```bash
+# Start with default shell
+./scripts/run.sh
+
+# With authentication
+TTYD_CREDENTIAL="admin:secret" ./scripts/run.sh
+
+# Custom command
+TTYD_COMMAND="htop" ./scripts/run.sh
+```
+
+### With Caddy (HTTPS)
+
+```caddyfile
+terminal.example.com {
+    reverse_proxy localhost:7681
+}
+```
+
+## Security
+
+For production use:
+1. Always use `TTYD_CREDENTIAL` for authentication
+2. Put behind Caddy/nginx for HTTPS
+3. Consider network isolation