perfsprint 18→0：strconv.Itoa/FormatInt/FormatUint/FormatBool 替代 fmt.Sprintf、无动词 fmt.Errorf→errors.New、纯字符串拼接。全部语义等价（已核对 diff）。修正 fixer 遗留的 import 问题（引入 goimports 统一整理）。

Result: {"status":"keep","total_issues":56,"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":0,"golint_prealloc":3,"golint_recvcheck":7,"golint_usestdlibvars":3,"golint_wastedassign":7,"golint_total":55,"eslint_problems":1,"eslint_errors":0,"eslint_warnings":1,"tsc_errors":0,"measure_s":47}

pkg/pagesarchive/path.go

@@ -4,6 +4,7 @@
 package pagesarchive
 
 import (
+	"errors"
 	"fmt"
 	"path"
 	"strings"
@@ -18,7 +19,7 @@ func NormalizeLogicalPath(raw string, allowEmpty bool) (string, error) {
 		if allowEmpty {
 			return "", nil
 		}
-		return "", fmt.Errorf("pages path is required")
+		return "", errors.New("pages path is required")
 	}
 	if err := validateLogicalPathText(raw); err != nil {
 		return "", err
@@ -29,7 +30,7 @@ func NormalizeLogicalPath(raw string, allowEmpty bool) (string, error) {
 		if allowEmpty {
 			return "", nil
 		}
-		return "", fmt.Errorf("pages path is required")
+		return "", errors.New("pages path is required")
 	}
 	if strings.HasPrefix(cleaned, "/") || cleaned == ".." || strings.HasPrefix(cleaned, "../") {
 		return "", fmt.Errorf("pages path escapes directory: %s", raw)
@@ -39,7 +40,7 @@ func NormalizeLogicalPath(raw string, allowEmpty bool) (string, error) {
 
 func validateLogicalPathText(raw string) error {
 	if !utf8.ValidString(raw) {
-		return fmt.Errorf("pages path is not valid UTF-8")
+		return errors.New("pages path is not valid UTF-8")
 	}
 	if strings.Contains(raw, "\\") {
 		return fmt.Errorf("pages path must use POSIX separators: %s", raw)
@@ -56,7 +57,7 @@ func validateLogicalPathText(raw string) error {
 func validateLogicalPathRunes(raw string) error {
 	for _, r := range raw {
 		if r == 0 || unicode.IsControl(r) {
-			return fmt.Errorf("pages path contains a control character")
+			return errors.New("pages path contains a control character")
 		}
 		if r == '\'' || r == '"' || r == ';' {
 			return fmt.Errorf("pages path contains an unsupported character: %s", raw)