feat: Modernize package with ES modules and improve error handling

- Update to ES modules syntax throughout the codebase
- Add fileURLToPath and dirname imports to handle __dirname in ES modules
- Upgrade Anthropic SDK from 0.10.0 to 0.39.0
- Fix JSON parsing to handle responses wrapped in Markdown code blocks
- Improve documentation with clearer installation instructions
- Add important notes about ES modules and SDK requirements
- Update environment examples with API key format and model recommendations
- Include index.js in package files list
- Bump version to 1.0.2

scripts/prepare-package.js

@@ -5,9 +5,14 @@
  * It ensures all necessary files are included and properly configured.
  */
 
-const fs = require('fs');
-const path = require('path');
-const { execSync } = require('child_process');
+import fs from 'fs';
+import path from 'path';
+import { execSync } from 'child_process';
+import { fileURLToPath } from 'url';
+import { dirname } from 'path';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
 
 // Define colors for console output
 const COLORS = {