Rename Foundry handoffs to tasks (#239)

* Restore foundry onboarding stack

* Consolidate foundry rename

* Create foundry tasks without prompts

* Rename Foundry handoffs to tasks

foundry/docker/backend.preview.Dockerfile

@@ -0,0 +1,49 @@
+# syntax=docker/dockerfile:1.7
+
+FROM oven/bun:1.3
+
+ARG GIT_SPICE_VERSION=v0.23.0
+ARG SANDBOX_AGENT_VERSION=0.3.0
+
+RUN apt-get update \
+  && apt-get install -y --no-install-recommends \
+    ca-certificates \
+    curl \
+    git \
+    gh \
+    nodejs \
+    npm \
+    openssh-client \
+  && npm install -g pnpm@10.28.2 \
+  && rm -rf /var/lib/apt/lists/*
+
+RUN set -eux; \
+  arch="$(dpkg --print-architecture)"; \
+  case "$arch" in \
+    amd64) spice_arch="x86_64" ;; \
+    arm64) spice_arch="aarch64" ;; \
+    *) echo "Unsupported architecture for git-spice: $arch" >&2; exit 1 ;; \
+  esac; \
+  tmpdir="$(mktemp -d)"; \
+  curl -fsSL "https://github.com/abhinav/git-spice/releases/download/${GIT_SPICE_VERSION}/git-spice.Linux-${spice_arch}.tar.gz" -o "${tmpdir}/git-spice.tgz"; \
+  tar -xzf "${tmpdir}/git-spice.tgz" -C "${tmpdir}"; \
+  install -m 0755 "${tmpdir}/gs" /usr/local/bin/gs; \
+  ln -sf /usr/local/bin/gs /usr/local/bin/git-spice; \
+  rm -rf "${tmpdir}"
+
+RUN curl -fsSL "https://releases.rivet.dev/sandbox-agent/${SANDBOX_AGENT_VERSION}/install.sh" | sh
+
+ENV PATH="/root/.local/bin:${PATH}"
+ENV SANDBOX_AGENT_BIN="/root/.local/bin/sandbox-agent"
+
+WORKDIR /workspace/quebec
+
+COPY quebec /workspace/quebec
+COPY rivet-checkout /workspace/rivet-checkout
+
+RUN pnpm install --frozen-lockfile
+RUN pnpm --filter @sandbox-agent/foundry-shared build
+RUN pnpm --filter @sandbox-agent/foundry-client build
+RUN pnpm --filter @sandbox-agent/foundry-backend build
+
+CMD ["bash", "-lc", "git config --global --add safe.directory /workspace/quebec >/dev/null 2>&1 || true; exec bun packages/backend/dist/index.js start --host 0.0.0.0 --port 7841"]