Add CCLI (CLI agent integration) complete implementation

- Complete Gemini CLI agent adapter with SSH execution
- CLI agent factory with connection pooling
- SSH executor with AsyncSSH for remote CLI execution
- Backend integration with CLI agent manager
- MCP server updates with CLI agent tools
- Frontend UI updates for mixed agent types
- Database migrations for CLI agent support
- Docker deployment with CLI source integration
- Comprehensive documentation and testing

🤖 Generated with [Claude Code](https://claude.ai/code)

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

scripts/test-ssh-simple.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+
+# Simple SSH Connection Test for CCLI
+set -e
+
+GREEN='\033[0;32m'
+BLUE='\033[0;34m'
+NC='\033[0m'
+
+function log() { echo -e "${BLUE}[$(date +'%H:%M:%S')]${NC} $1"; }
+function success() { echo -e "${GREEN}✅ $1${NC}"; }
+
+echo "🔗 Simple SSH Connection Tests"
+
+# Test basic SSH functionality
+for host in walnut ironwood; do
+    log "Testing SSH to $host..."
+    if ssh -o ConnectTimeout=5 $host "echo 'SSH working'; hostname; uptime | cut -d',' -f1"; then
+        success "SSH connection to $host working"
+    fi
+done
+
+# Test SSH with connection sharing
+log "Testing SSH connection sharing..."
+control_path="/tmp/ssh_test_$$"
+ssh_opts="-o ControlMaster=auto -o ControlPath=$control_path -o ControlPersist=10"
+
+# Establish master connection to walnut
+ssh $ssh_opts walnut "echo 'Master connection established'" > /dev/null
+
+# Test reuse (should be very fast)
+start_time=$(date +%s.%N)
+ssh $ssh_opts walnut "echo 'Reused connection'"
+end_time=$(date +%s.%N)
+duration=$(echo "$end_time - $start_time" | bc -l)
+
+success "SSH connection reuse took ${duration:0:4}s"
+
+# Clean up
+ssh $ssh_opts -O exit walnut 2>/dev/null || true
+rm -f "$control_path"
+
+success "SSH pooling tests completed successfully"