fix: resolve gosec integer overflow and unconvert issues

- Fix G115 integer overflow by converting uint32 to int comparison
- Remove unnecessary int() conversions for syscall constants
- syscall.Stdin/Stderr/Stdout are already int type

internal/secret/debug_test.go

@@ -64,7 +64,7 @@ func TestDebugLogging(t *testing.T) {
 
 				// Override the debug logger for testing
 				oldLogger := debugLogger
-				if term.IsTerminal(int(syscall.Stderr)) {
+				if term.IsTerminal(syscall.Stderr) {
 					// TTY: use colorized handler with our buffer
 					debugLogger = slog.New(newColorizedHandler(&buf))
 				} else {