feat: add build.sh script to generate distribution packages

build.sh

+#!/bin/bash
+set -e
+
+echo "=== Building Hermes Node Gateway Plugin ==="
+
+# Verify Python syntax
+echo "Checking Python syntax..."
+python3 -m py_compile __init__.py
+
+# Validate plugin.yaml
+if ! command -v python3 &> /dev/null; then
+    echo "ERROR: python3 not found"
+    exit 1
+fi
+
+python3 -c "
+import yaml
+with open('plugin.yaml') as f:
+    config = yaml.safe_load(f)
+assert config['name'] == 'hermes-node-gateway', 'Plugin name mismatch'
+assert config['version'], 'Version required'
+print('Plugin manifest valid')
+"
+
+echo ""
+echo "✅ Build complete! Plugin is ready."
+echo ""
+echo "To install:"
+echo "  1. Copy this directory to ~/.hermes/plugins/"
+echo "  2. Add 'hermes-node-gateway' to plugins.enabled in ~/.hermes/config.yaml"
+echo "  3. Restart Hermes Agent"
+echo ""
+echo "Or use the make_hermes_plugin.py script to package as wheel."