Go 1.27.1, and the code it can say more simply

Modules declare go 1.27.1 and the build images follow. go fix applied the
modernizers, and SHA3-256 now comes from the standard library's crypto/sha3;
omitzero is not applied, since it changes what the JSON says.

Co-authored-by: Hanzo Dev <[email protected]>

channel.go

@@ -124,10 +124,7 @@ func (c *Conn) Write(b []byte) (int, error) {
 	const maxPlain = MaxFrameSize - chacha20poly1305.Overhead
 	written := 0
 	for written < len(b) {
-		end := written + maxPlain
-		if end > len(b) {
-			end = len(b)
-		}
+		end := min(written+maxPlain, len(b))
 		chunk := b[written:end]
 
 		if c.writeSeq == ^uint64(0) {

coverage_test.go

@@ -1214,7 +1214,7 @@ func TestXWingDecapsulateLowOrderEph(t *testing.T) {
 		t.Fatalf("identity: %v", err)
 	}
 	ct := make([]byte, XWingCiphertextSize)
-	for i := 0; i < XWingCiphertextSize-32; i++ {
+	for i := range XWingCiphertextSize - 32 {
 		ct[i] = 0xCC
 	}
 	// Trailing 32 bytes are zero → low-order point → ssX errors.
@@ -1239,10 +1239,7 @@ type partialWriter struct {
 func (w *partialWriter) Write(p []byte) (int, error) {
 	if w.written < w.succeed {
 		room := w.succeed - w.written
-		n := len(p)
-		if n > room {
-			n = room
-		}
+		n := min(len(p), room)
 		w.written += n
 		if n < len(p) {
 			return n, w.err
@@ -1432,12 +1429,10 @@ func TestConcurrentReadsAreSerialized(t *testing.T) {
 	// 8 concurrent writes from server, 8 concurrent reads on client.
 	const N = 8
 	var wg sync.WaitGroup
-	for i := 0; i < N; i++ {
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
+	for range N {
+		wg.Go(func() {
 			_, _ = sConn.Write([]byte("z"))
-		}()
+		})
 	}
 	got := 0
 	for got < N {

go.mod

@@ -1,6 +1,6 @@
 module github.com/luxfi/zwing
 
-go 1.26.4
+go 1.27.1
 
 require (
 	github.com/luxfi/api v1.1.1

kem.go

@@ -5,12 +5,12 @@ package zwing
 
 import (
 	"crypto/rand"
+	"crypto/sha3"
 	"errors"
 	"io"
 
 	"github.com/luxfi/crypto/mlkem"
 	"golang.org/x/crypto/curve25519"
-	"golang.org/x/crypto/sha3"
 )
 
 // X-Wing KEM combiner per IETF draft-connolly-cfrg-xwing-kem.