fix(lifecycle): remove nolint directives — use blank identifier instead

Policy gate requires //lint:ignore, not //nolint:. Simpler fix:
use _, _ = to discard write errors (best-effort log writes).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: itcmsgr

internal/lifecycle/logger.go

@@ -118,6 +118,6 @@ func (l *Logger) emit(event EventType, data any) {
 		return
 	}
 
-	l.w.Write(out)    //nolint:errcheck
-	l.w.Write([]byte("\n")) //nolint:errcheck
+	_, _ = l.w.Write(out)
+	_, _ = l.w.Write([]byte("\n"))
 }