feat: v2.0 — card UI, AI agents (Claude/DeepSeek), collapsible commands

Major update:
- Card-based session layout with colored group indicators
- AI agent: Claude API, DeepSeek API, local keyword search
- Collapsible command panel — more space for agent
- macOS build script (build_mac.sh)
- Updated README with Windows/macOS install instructions
- Config persistence in pca_config.json

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

build_mac.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+echo "=== PCA SSH v2.0 — Build for macOS ==="
+
+# Check Python
+if ! command -v python3 &>/dev/null; then
+    echo "Python3 not found!"
+    echo "Install: brew install python3"
+    echo "Or: https://python.org/downloads/"
+    exit 1
+fi
+
+echo "Installing dependencies..."
+pip3 install paramiko pillow pyinstaller
+
+echo "Generating icon..."
+python3 gen_icon.py
+
+echo "Building PCA_SSH.app..."
+if [ -f pca_ssh.icns ]; then
+    python3 -m PyInstaller --onefile --windowed --name "PCA_SSH" --icon=pca_ssh.icns ssh_manager.py
+else
+    python3 -m PyInstaller --onefile --windowed --name "PCA_SSH" ssh_manager.py
+fi
+
+if [ -f dist/PCA_SSH ]; then
+    echo ""
+    echo "DONE! App: dist/PCA_SSH"
+    echo "Copy to /Applications or run directly"
+    echo "sessions.json and pca_config.json save next to executable"
+else
+    echo "BUILD FAILED"
+fi