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>

lib/cockpit-service

@@ -0,0 +1,56 @@
+#!/bin/bash
+# Helper script for cockpits to request services
+# Mount this into cockpits at /usr/local/bin/cockpit-service
+#
+# Usage:
+#   cockpit-service start <service>
+#   cockpit-service stop <service>
+#   cockpit-service status
+#   cockpit-service list
+
+REQUESTS_DIR="/var/cockpit/service_requests"
+PROJECT="${PROJECT:-$(basename $(dirname /workspace))}"  # Detect from workspace
+
+# Try to get project from workspace mount
+if [ -d "/workspace" ]; then
+    # /workspace is typically mounted from /home/<project>
+    # Read from env or use parent dir name
+    PROJECT="${COCKPIT_PROJECT:-unknown}"
+fi
+
+# Ensure project dir exists
+mkdir -p "$REQUESTS_DIR/$PROJECT"
+
+action="$1"
+service="$2"
+
+if [ -z "$action" ]; then
+    echo "Usage: cockpit-service <start|stop|status|list> [service]"
+    echo "  cockpit-service start backend"
+    echo "  cockpit-service stop backend"
+    echo "  cockpit-service status"
+    echo "  cockpit-service list"
+    exit 1
+fi
+
+request_id="${action}-${service:-all}-$(date +%s)"
+request_file="$REQUESTS_DIR/$PROJECT/${request_id}.request"
+response_file="$REQUESTS_DIR/$PROJECT/${request_id}.response"
+
+# Write request
+echo "{\"action\":\"$action\",\"service\":\"$service\"}" > "$request_file"
+echo "Request submitted: $request_id"
+
+# Wait for response (max 30s)
+for i in $(seq 1 30); do
+    if [ -f "$response_file" ]; then
+        echo "Response:"
+        cat "$response_file"
+        rm -f "$response_file"
+        exit 0
+    fi
+    sleep 1
+done
+
+echo "Timeout waiting for response"
+exit 1