style: go vet applied

cmd/gol/gol.go

@@ -68,6 +68,7 @@ func game(initrandom bool) {
 	// catch interrupt signals
 	sigs := make(chan os.Signal, 1)
 	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP)
+	defer signal.Stop(sigs)
 
 	// initialize screen
 	term.StartFullscreen()

gol/arena.go

@@ -103,7 +103,7 @@ func (a *Arena) processChunk(to *Arena, startY, endY int) {
 		yCurrOffset := y * w
 		yNextOffset := yNext * w
 
-		for x := 0; x < w; x++ {
+		for x := range w {
 			// Precompute x indices
 			xPrev := (x - 1 + w) % w
 			xNext := (x + 1) % w

gol/arena_test.go

@@ -72,7 +72,7 @@ func TestRules(t *testing.T) {
 		// Set center
 		a.Set(1, 1, alive)
 		// Set neighbors
-		for i := 0; i < activeNeighbors; i++ {
+		for i := range activeNeighbors {
 			nx, ny := neighbors[i][0], neighbors[i][1]
 			a.Set(nx, ny, true)
 		}
@@ -134,8 +134,8 @@ func BenchmarkNextGen(b *testing.B) {
 	next := New(size, size)
 
 	// Initialize with some pattern (e.g., random-ish)
-	for y := 0; y < size; y++ {
-		for x := 0; x < size; x++ {
+	for y := range size {
+		for x := range size {
 			if (x+y)%2 == 0 {
 				arena.Set(x, y, true)
 			}
@@ -143,7 +143,7 @@ func BenchmarkNextGen(b *testing.B) {
 	}
 
 	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
+	for b.Loop() {
 		arena.NextGen(next)
 		arena, next = next, arena
 	}