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

scripts/autorun.sh

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+#!/bin/bash
+set -e
+
+TTYD_VERSION="${TTYD_VERSION:-1.7.7}"
+
+# Idempotent ttyd installation
+install_ttyd() {
+    if command -v ttyd &>/dev/null; then
+        echo "ttyd already installed: $(ttyd --version)"
+        return 0
+    fi
+
+    echo "Installing ttyd v${TTYD_VERSION}..."
+
+    # Detect architecture
+    local arch
+    case "$(uname -m)" in
+        x86_64)  arch="x86_64" ;;
+        aarch64) arch="aarch64" ;;
+        armv7l)  arch="armhf" ;;
+        *)
+            echo "Unsupported architecture: $(uname -m)"
+            exit 1
+            ;;
+    esac
+
+    # Download prebuilt binary
+    local url="https://github.com/tsl0922/ttyd/releases/download/${TTYD_VERSION}/ttyd.${arch}"
+    curl -sSL "$url" -o /usr/local/bin/ttyd
+    chmod +x /usr/local/bin/ttyd
+
+    echo "ttyd installed: $(ttyd --version)"
+}
+
+install_ttyd

scripts/run.sh

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+#!/bin/bash
+set -e
+
+TTYD_PORT="${TTYD_PORT:-7681}"
+TTYD_COMMAND="${TTYD_COMMAND:-/bin/bash}"
+TTYD_CREDENTIAL="${TTYD_CREDENTIAL:-}"
+TTYD_OPTIONS="${TTYD_OPTIONS:-}"
+
+# Build command arguments
+args=()
+args+=("--port" "$TTYD_PORT")
+
+# Add authentication if set
+if [ -n "$TTYD_CREDENTIAL" ]; then
+    args+=("--credential" "$TTYD_CREDENTIAL")
+fi
+
+# Add any extra options
+if [ -n "$TTYD_OPTIONS" ]; then
+    # shellcheck disable=SC2206
+    args+=($TTYD_OPTIONS)
+fi
+
+echo "Starting ttyd on port $TTYD_PORT..."
+echo "Command: $TTYD_COMMAND"
+[ -n "$TTYD_CREDENTIAL" ] && echo "Authentication: enabled"
+
+exec ttyd "${args[@]}" $TTYD_COMMAND