Add vnc test

arc/workflows/vnc-demo/Dockerfile.vnc

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+FROM node:22-bookworm-slim
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        # VNC & desktop
+        xvfb \
+        xfce4 \
+        xfce4-terminal \
+        x11vnc \
+        novnc \
+        dbus-x11 \
+        # X11 libraries
+        libx11-6 \
+        libxrandr2 \
+        libxext6 \
+        libxrender1 \
+        libxfixes3 \
+        libxss1 \
+        libxtst6 \
+        libxi6 \
+        # Utilities
+        curl \
+        git \
+        ca-certificates \
+        procps \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /root

arc/workflows/vnc-demo/browse-prompt.md

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+You have Playwright MCP tools available running in headed mode — a user is watching via VNC.
+
+1. Call the `browser_install` tool to ensure the browser is installed.
+2. Use `browser_navigate` to go to https://news.ycombinator.com
+3. Use `browser_snapshot` to capture the page content
+4. Use `browser_take_screenshot` to save a screenshot to `/root/output/01-hn-front-page.png`
+5. Click on the first story link
+6. Wait a moment, then use `browser_take_screenshot` to save to `/root/output/02-first-story.png`
+7. Use `browser_navigate_back` to go back
+8. Click on the "new" link in the nav bar
+9. Use `browser_take_screenshot` to save to `/root/output/03-newest.png`
+10. Navigate to https://en.wikipedia.org/wiki/Golden_Gate_Bridge
+11. Use `browser_take_screenshot` to save to `/root/output/04-golden-gate.png`
+12. Scroll down to see images, then take another screenshot to `/root/output/05-golden-gate-scrolled.png`
+
+Take your time between actions so the VNC viewer can see what's happening. Write a brief summary of what you found.

arc/workflows/vnc-demo/workflow.dot

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+digraph VNCDemo {
+    graph [
+        goal="Browse the web with Playwright while user watches via VNC",
+        model_stylesheet="* { llm_model: claude-sonnet-4-6; llm_provider: anthropic }"
+    ]
+    rankdir=LR
+
+    start [shape=Mdiamond, label="Start"]
+    exit  [shape=Msquare, label="Exit"]
+
+    start_vnc [label="Start VNC", shape=parallelogram, script="setsid sh -c 'Xvfb :99 -screen 0 1920x1080x24 &\nsleep 1\nexport DISPLAY=:99\nstartxfce4 &\nsleep 1\nx11vnc -display :99 -forever -nopw -rfbport 5900' </dev/null >/dev/null 2>&1 &\nsleep 3\nmkdir -p /root/output\necho 'VNC ready on display :99'"]
+
+    browse [label="Browse the Web", prompt="@browse-prompt.md"]
+
+    start -> start_vnc -> browse -> exit
+}

arc/workflows/vnc-demo/workflow.toml

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+version = 1
+goal = "Browse the web with Playwright while user watches via VNC"
+graph = "workflow.dot"
+
+[llm]
+model = "claude-sonnet-4-6"
+
+[sandbox]
+provider = "daytona"
+
+[sandbox.daytona]
+auto_stop_interval = 30
+
+[sandbox.daytona.labels]
+project = "vnc-demo"
+
+[sandbox.daytona.snapshot]
+name = "vnc-demo-v1"
+cpu = 4
+memory = 8
+disk = 10
+dockerfile = { path = "Dockerfile.vnc" }
+
+[assets]
+include = ["output/**"]
+
+[mcp_servers.playwright]
+type = "sandbox"
+command = ["npx", "@playwright/mcp@latest", "--port", "3100", "--no-headless", "--browser", "chromium"]
+port = 3100
+startup_timeout_secs = 60
+tool_timeout_secs = 120
+env = { DISPLAY = ":99" }