clean up debugging prints and silence successful execution output

- Remove leftover DEBUG prints from CLI and wireguard internal packages.
- Silence stdout during successful command wrapping to ensure only the wrapped command's output is visible.
- Redirect all warnings and internal errors to stderr.
- Implement a verbose mode via `WG_WRAP_VERBOSE=1` to enable tunnel status messages.
- Update E2E tests to use verbose mode for verification of tunnel lifecycle events.
- Fix errcheck linting issue in wireguard.go and apply go fmt.

1 files changed, 3 insertions, 3 deletions

diff --git a/internal/namespace/lifecycle_test.go b/internal/namespace/lifecycle_test.go
index 9962e14..3e01ea9 100644
--- a/internal/namespace/lifecycle_test.go
+++ b/internal/namespace/lifecycle_test.go
@@ -87,7 +87,7 @@ func TestLifecycleReferenceCounting(t *testing.T) {
 		if err := RegisterProcess(pm, profile); err != nil {
 			t.Fatal(err)
 		}
-		
+
 		// Simulate the application flow: Unregister before checking if we are the last one
 		if err := UnregisterProcess(pm, profile); err != nil {
 			t.Fatal(err)
@@ -102,12 +102,12 @@ func TestLifecycleReferenceCounting(t *testing.T) {
 		if err := os.WriteFile(filepath.Join(pidsDir, "1234567"), []byte(""), 0644); err != nil {
 			t.Fatal(err)
 		}
-		
+
 		// Register a real process so that pruning has something to do
 		if err := RegisterProcess(pm, profile); err != nil {
 			t.Fatal(err)
 		}
-		
+
 		// Prune the stale one
 		if err := PruneStalePids(pm, profile); err != nil {
 			t.Fatal(err)