Add Context Studio Wizard — project scaffolding CLI

- wizard.sh: interactive bash wizard that scaffolds new CS projects
- lib/: utils, core install, project structure, workflow generation
- templates/: Dockerfile, devcontainer.json, agent presets (minimal/standard), system.json, roles, hook rules
- README: setup, usage, mobility workflow

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

templates/Dockerfile

@@ -0,0 +1,40 @@
+FROM node:22-bookworm-slim
+
+# ── System dependencies ──────────────────────────────────────────────────────
+# Build tools: needed for node-pty (native module) and Electron
+# xvfb + libgtk: needed if running Electron inside container with virtual display
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git \
+    curl \
+    wget \
+    ca-certificates \
+    python3 \
+    make \
+    g++ \
+    libx11-dev \
+    libxkbfile-dev \
+    libsecret-1-dev \
+    libfontconfig1 \
+    libgbm1 \
+    libasound2 \
+    xvfb \
+    && rm -rf /var/lib/apt/lists/*
+
+# ── Rust toolchain ───────────────────────────────────────────────────────────
+ENV RUSTUP_HOME=/usr/local/rustup \
+    CARGO_HOME=/usr/local/cargo \
+    PATH=/usr/local/cargo/bin:$PATH
+
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
+    | sh -s -- -y --no-modify-path --default-toolchain stable \
+    && rustup component add clippy rustfmt \
+    && chmod -R a+w /usr/local/rustup /usr/local/cargo
+
+# ── Claude Code CLI ──────────────────────────────────────────────────────────
+RUN npm install -g @anthropic-ai/claude-code
+
+# ── Workspace ────────────────────────────────────────────────────────────────
+WORKDIR /workspace
+
+# Context Studio Core is mounted at /opt/context-studio/core (read-only from host)
+# Workflow lives at /workspace/workflow (per-project, writable)