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}

pkg/cap/cap.go

@@ -238,14 +238,14 @@ func VerifyChallengeSolutions(token string, solutions []int, secret []byte, expe
 func Solve(token string, count, size, difficulty int) []int {
 	solutions := make([]int, count)
 	tokenFnv := fnv1a(token)
-	for i := 0; i < count; i++ {
+	for i := range count {
 		idxStr := strconv.Itoa(i + 1)
 		saltSeed := fnv1aResume(tokenFnv, idxStr)
 		targetSeed := fnv1aResume(saltSeed, "d")
 		salt := prngFromHash(saltSeed, size)
 		target := prngFromHash(targetSeed, difficulty)
 
-		for nonce := 0; nonce < 1000000; nonce++ {
+		for nonce := range 1000000 {
 			hashInput := salt + strconv.Itoa(nonce)
 			hashBytes := sha256.Sum256([]byte(hashInput))
 			hashHex := hex.EncodeToString(hashBytes[:])