modernize 37→5（-32）：interface{}→any、内置 max/min、slices/maps 辅助、strings.Cut/SplitSeq、strings.Builder（修复 mail.go O(n²) 拼接）。逐 hunk 核对语义等价；omitzero 冲突修复被自动跳过（wire 格式不变）；手动清 4 处遗留 sort import + 2 处 QF1012。

Result: {"status":"keep","total_issues":74,"golint_canonicalheader":8,"golint_errname":1,"golint_errorlint":12,"golint_forcetypeassert":3,"golint_gosec":0,"golint_intrange":3,"golint_modernize":5,"golint_nilnil":3,"golint_perfsprint":18,"golint_prealloc":3,"golint_recvcheck":7,"golint_usestdlibvars":3,"golint_wastedassign":7,"golint_total":73,"eslint_problems":1,"eslint_errors":0,"eslint_warnings":1,"tsc_errors":0,"measure_s":38}

internal/apps/agent/runtimeuser/runtimeuser.go

@@ -120,7 +120,7 @@ func ensureWorldTraversablePath(targetDir string) error {
 	if current == "" || current == "." {
 		return nil
 	}
-	for depth := 0; depth < maxDepth; depth++ {
+	for range maxDepth {
 		if err := os.Chmod(current, DefaultDirPerm); err != nil { //nolint:gosec // parent dirs must be traversable by the runtime user
 			if os.IsNotExist(err) || os.IsPermission(err) {
 				break