Builds for linux, windows, and macOS intel (#7)

* Builds for linux, windows, and macOS intel

* Add context to spawn errors

* Use shell to execute agent

scripts/prepare-db.js

@@ -0,0 +1,45 @@
+#!/usr/bin/env node
+
+const { execSync } = require('child_process');
+const fs = require('fs');
+const path = require('path');
+
+console.log('Preparing database for SQLx...');
+
+// Change to backend directory
+const backendDir = path.join(__dirname, '..', 'backend');
+process.chdir(backendDir);
+
+// Create temporary database file
+const dbFile = path.join(backendDir, 'prepare_db.sqlite');
+fs.writeFileSync(dbFile, '');
+
+try {
+  // Get absolute path (cross-platform)
+  const dbPath = path.resolve(dbFile);
+  const databaseUrl = `sqlite:${dbPath}`;
+  
+  console.log(`Using database: ${databaseUrl}`);
+  
+  // Run migrations
+  console.log('Running migrations...');
+  execSync('cargo sqlx migrate run', {
+    stdio: 'inherit',
+    env: { ...process.env, DATABASE_URL: databaseUrl }
+  });
+  
+  // Prepare queries
+  console.log('Preparing queries...');
+  execSync('cargo sqlx prepare', {
+    stdio: 'inherit', 
+    env: { ...process.env, DATABASE_URL: databaseUrl }
+  });
+  
+  console.log('Database preparation complete!');
+  
+} finally {
+  // Clean up temporary file
+  if (fs.existsSync(dbFile)) {
+    fs.unlinkSync(dbFile);
+  }
+}