just overwrite bundles, don't delete then re-add

pipeline/05_bundle_gen/main.go

@@ -107,15 +107,9 @@ func main() {
 		os.MkdirAll(cfg.OutputDir, 0755)
 	}
 
-	// Clean old bundles before writing new ones
-	if !cfg.DryRun {
-		fmt.Println("Cleaning old bundles from S3...")
-		if err := s3DeletePrefix(cfg.SiteBucket, "tabs/"); err != nil {
-			log.Fatalf("Failed to clean old bundles: %v", err)
-		}
-	}
-
 	// Stream hosts from DB in pages, convert icons, write bundles incrementally
+	// Bundles are written in-place (overwriting previous run). No delete-first step,
+	// so the live site always has valid data even if bundle gen crashes midway.
 	fmt.Println("Processing hosts and writing bundles...")
 
 	bundleCount := 0
@@ -240,10 +234,3 @@ func main() {
 
 	writeStats(stats)
 }
-
-func max(a, b int) int {
-	if a > b {
-		return a
-	}
-	return b
-}