Appendix A: Preliminary Assessment of a Potential Strategy of Covert Penetration, Systemic Constraints, and the Current Stage of Scenario Realization

This appendix continues the main model by reconstructing the hypothetical internal logic of an advanced external system engaged in long-term observation of human civilization. It analyzes strategic constraints favoring minimal presence and indirect observability over direct intervention. Key topics include the self-reinforcing nature of human technological competition, the transition from localized to structural-algorithmic observation, and the current stage in which civilization itself becomes the primary source of its own observability through digital infrastructures. The text remains strictly hypothetical and focuses on systemic rather than evidentiary questions.