Replace shell zip command with archiver for Cloudflare Pages compatibility

Cloudflare Pages build environment doesn't have the zip CLI tool,
causing zip bundle creation to fail silently. Switched to the archiver
npm package for cross-platform zip generation.

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

scripts/lib/zip.js

@@ -2,11 +2,13 @@
  * ZIP Generation Utilities
  *
  * Creates ZIP bundles for each provider's distribution
+ * Uses archiver instead of shell `zip` for cross-platform compatibility
+ * (Cloudflare Pages build environment may not have zip installed)
  */
 
-import { $ } from 'bun';
 import path from 'path';
-import { existsSync, readdirSync, statSync } from 'fs';
+import { createWriteStream, existsSync, statSync } from 'fs';
+import archiver from 'archiver';
 
 /**
  * Create ZIP file for a provider directory
@@ -18,26 +20,30 @@ export async function createProviderZip(providerDir, distDir, providerName) {
   const zipFileName = `${providerName}.zip`;
   const zipPath = path.join(distDir, zipFileName);
 
-  // Check if provider directory exists
   if (!existsSync(providerDir)) {
     console.warn(`⚠️  Provider directory not found: ${providerDir}`);
     return;
   }
 
-  // Remove existing zip if present
-  if (existsSync(zipPath)) {
-    await $`rm ${zipPath}`.quiet();
-  }
-
   try {
-    // Create zip using bun's shell
-    // cd into provider dir and zip all contents
-    await $`cd ${providerDir} && zip -r ../${zipFileName} . -x "*.DS_Store"`.quiet();
+    await new Promise((resolve, reject) => {
+      const output = createWriteStream(zipPath);
+      const archive = archiver('zip', { zlib: { level: 9 } });
+
+      output.on('close', resolve);
+      archive.on('error', reject);
+
+      archive.pipe(output);
+      archive.glob('**/*', {
+        cwd: providerDir,
+        dot: true,
+        ignore: ['**/.DS_Store'],
+      });
+      archive.finalize();
+    });
 
-    // Get file size for reporting
     const stats = statSync(zipPath);
     const sizeMB = (stats.size / 1024 / 1024).toFixed(2);
-
     console.log(`  📦 ${zipFileName} (${sizeMB} MB)`);
   } catch (error) {
     console.error(`  ❌ Failed to create ${zipFileName}:`, error.message);
@@ -51,7 +57,6 @@ export async function createProviderZip(providerDir, distDir, providerName) {
 export async function createAllZips(distDir) {
   console.log('\n📦 Creating ZIP bundles...');
 
-  // Universal ZIPs (unprefixed + prefixed)
   await createProviderZip(path.join(distDir, 'universal'), distDir, 'universal');
   await createProviderZip(path.join(distDir, 'universal-prefixed'), distDir, 'universal-prefixed');
 }