fix: remove unused fmt and json imports from activetime test

Author: blackwell-systems

internal/claude/active_live_activetime_test.go

@@ -1,8 +1,6 @@
 package claude
 
 import (
-	"encoding/json"
-	"fmt"
 	"os"
 	"path/filepath"
 	"testing"
@@ -130,7 +128,7 @@ func TestParseLiveActiveTime_MultipleResumptions(t *testing.T) {
 		t.Fatalf("expected ActiveMinutes~3, got %f", stats.ActiveMinutes)
 	}
 
-	_ = fmt.Sprintf("") // keep fmt import for writeLiveJSONL's json.Marshal usage
+
 }
 
 func TestParseLiveActiveTime_ExactThreshold(t *testing.T) {
@@ -156,5 +154,3 @@ func TestParseLiveActiveTime_ExactThreshold(t *testing.T) {
 // mkAssistantWithUsage helper uses the one from active_live_context_test.go.
 // Both are accessible since this is in the same test package.
 
-// Ensure json import is used (needed by writeLiveJSONL indirectly).
-var _ = json.Marshal