Refactor cockpit to use DockerTmuxController pattern

Based on claude-code-tools TmuxCLIController, this refactor:

- Added DockerTmuxController class for robust tmux session management
- Implements send_keys() with configurable delay_enter
- Implements capture_pane() for output retrieval
- Implements wait_for_prompt() for pattern-based completion detection
- Implements wait_for_idle() for content-hash-based idle detection
- Implements wait_for_shell_prompt() for shell prompt detection

Also includes workflow improvements:
- Pre-task git snapshot before agent execution
- Post-task commit protocol in agent guidelines

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker/Dockerfile

@@ -0,0 +1,41 @@
+# Luzia Sandbox - Lightweight agent execution environment
+# Agents execute inside this container as project users
+
+FROM alpine:3.19
+
+# Install common tools agents need
+RUN apk add --no-cache \
+    bash \
+    git \
+    curl \
+    wget \
+    jq \
+    grep \
+    sed \
+    gawk \
+    findutils \
+    coreutils \
+    diffutils \
+    patch \
+    openssh-client \
+    nodejs \
+    npm \
+    python3 \
+    py3-pip \
+    make \
+    gcc \
+    g++ \
+    musl-dev
+
+# Install common Node.js tools
+RUN npm install -g \
+    typescript \
+    ts-node \
+    prettier \
+    eslint
+
+# Set workspace
+WORKDIR /workspace
+
+# Keep container alive for docker exec commands
+CMD ["tail", "-f", "/dev/null"]

docker/cockpit/Dockerfile

@@ -0,0 +1,72 @@
+# Luzia Cockpit - Interactive Claude Agent Container
+# Provides tmux-based session management for human-in-the-loop workflows
+
+FROM debian:bookworm-slim
+
+# Avoid interactive prompts
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install base tools
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    tmux \
+    curl \
+    git \
+    jq \
+    ca-certificates \
+    gnupg \
+    procps \
+    less \
+    vim-tiny \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Node.js 20 LTS
+RUN curl -fsSL https://deb.nodesource.com/setup_20.x | bash - \
+    && apt-get install -y nodejs \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Claude CLI globally
+RUN npm install -g @anthropic-ai/claude-code
+
+# Create workspace directory
+RUN mkdir -p /workspace /root/.claude
+
+# Tmux configuration for better session handling
+RUN cat > /root/.tmux.conf << 'EOF'
+# Increase scrollback buffer
+set-option -g history-limit 50000
+
+# Don't rename windows automatically
+set-option -g allow-rename off
+
+# Start windows and panes at 1, not 0
+set -g base-index 1
+setw -g pane-base-index 1
+
+# Enable mouse (for human attach)
+set -g mouse on
+
+# Status bar showing session info
+set -g status-left '[#S] '
+set -g status-right '%H:%M '
+
+# Keep tmux server running even if no clients
+set -g exit-empty off
+EOF
+
+# Entry script that starts tmux and keeps container alive
+RUN cat > /entrypoint.sh << 'EOF'
+#!/bin/bash
+set -e
+
+# Start tmux server with agent session
+tmux new-session -d -s agent -n main
+
+# Keep container alive by waiting on tmux
+exec tmux wait-for exit-signal
+EOF
+RUN chmod +x /entrypoint.sh
+
+WORKDIR /workspace
+
+# Default command starts tmux server
+CMD ["/entrypoint.sh"]