refactor: modularize audit and harden build validation

audit/internal/platform/platform_stress.go

@@ -1,9 +1,7 @@
 package platform
 
 import (
-	"archive/tar"
 	"bytes"
-	"compress/gzip"
 	"context"
 	"encoding/csv"
 	"fmt"
@@ -532,44 +530,3 @@ func containsComponent(components []string, name string) bool {
 	}
 	return false
 }
-
-func packPlatformDir(dir, dest string) error {
-	f, err := os.Create(dest)
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-	gz := gzip.NewWriter(f)
-	defer gz.Close()
-	tw := tar.NewWriter(gz)
-	defer tw.Close()
-
-	entries, err := os.ReadDir(dir)
-	if err != nil {
-		return err
-	}
-	base := filepath.Base(dir)
-	for _, e := range entries {
-		if e.IsDir() {
-			continue
-		}
-		fpath := filepath.Join(dir, e.Name())
-		data, err := os.ReadFile(fpath)
-		if err != nil {
-			continue
-		}
-		hdr := &tar.Header{
-			Name:    filepath.Join(base, e.Name()),
-			Size:    int64(len(data)),
-			Mode:    0644,
-			ModTime: time.Now(),
-		}
-		if err := tw.WriteHeader(hdr); err != nil {
-			return err
-		}
-		if _, err := tw.Write(data); err != nil {
-			return err
-		}
-	}
-	return nil
-}