move MXL retry policy to adapter

internal/adapter/mxl/retry.go

@@ -1,4 +1,4 @@
-package playback
+package mxladapter
 
 import (
 	"context"
@@ -6,7 +6,8 @@ import (
 	"mxl-player/internal/source"
 )
 
-func shouldRetrySourceError(err error) bool {
+// ShouldRetry reports whether an MXL source error should start another attempt.
+func ShouldRetry(err error) bool {
 	if errors.Is(err, context.Canceled) {
 		return false
 	}

internal/adapter/mxl/retry_test.go

@@ -1,4 +1,4 @@
-package playback
+package mxladapter
 
 import (
 	"context"
@@ -66,7 +66,7 @@ func TestShouldRetrySourceError(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			if got := shouldRetrySourceError(tt.err); got != tt.want {
+			if got := ShouldRetry(tt.err); got != tt.want {
 				t.Errorf("shouldRetrySourceError() = %t, want %t", got, tt.want)
 			}
 		})