feat: desktop computer-use APIs with neko-based streaming

Add desktop runtime management (Xvfb, openbox, dbus), screen capture,
mouse/keyboard input, and video streaming via neko binary extracted
from the m1k1o/neko container. Includes Docker test rig, TypeScript SDK
desktop support, and inspector Desktop tab.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker/runtime/Dockerfile

@@ -149,7 +149,8 @@ FROM debian:bookworm-slim
 RUN apt-get update && apt-get install -y \
     ca-certificates \
     curl \
-    git && \
+    git \
+    ffmpeg && \
     rm -rf /var/lib/apt/lists/*
 
 # Copy the binary from builder

docker/test-agent/Dockerfile

@@ -0,0 +1,42 @@
+FROM rust:1.88.0-bookworm AS builder
+WORKDIR /build
+
+COPY Cargo.toml Cargo.lock ./
+COPY server/ ./server/
+COPY gigacode/ ./gigacode/
+COPY resources/agent-schemas/artifacts/ ./resources/agent-schemas/artifacts/
+COPY scripts/agent-configs/ ./scripts/agent-configs/
+
+ENV SANDBOX_AGENT_SKIP_INSPECTOR=1
+
+RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/usr/local/cargo/git \
+    --mount=type=cache,target=/build/target \
+    cargo build -p sandbox-agent --release && \
+    cp target/release/sandbox-agent /sandbox-agent
+
+FROM node:22-bookworm-slim
+RUN apt-get update -qq && \
+    apt-get install -y -qq --no-install-recommends \
+      ca-certificates \
+      bash \
+      libstdc++6 \
+      xvfb \
+      openbox \
+      xdotool \
+      imagemagick \
+      ffmpeg \
+      x11-xserver-utils \
+      dbus-x11 \
+      xauth \
+      fonts-dejavu-core \
+      xterm \
+      > /dev/null 2>&1 && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY --from=builder /sandbox-agent /usr/local/bin/sandbox-agent
+
+EXPOSE 3000
+
+ENTRYPOINT ["/usr/local/bin/sandbox-agent"]
+CMD ["server", "--host", "0.0.0.0", "--port", "3000", "--no-token"]