[squad:plan] Lattice Hollow — Security & Data Privacy Review: "Quiet Vault" (Kujan)

**Owner:** Kujan — Security Engineer

Part of the Lattice Hollow plan (#58481).

Goals:
- Review the demo's data handling and shipping posture, even for a low-risk single-player game.
- Deliverables: inventory of stored data, save-file review, third-party dependency check, telemetry decision record.
- Guidance on minimizing local data collection and avoiding unnecessary network behavior.
- Risk review for crash logs, user identifiers, and build distribution artifacts.

Depends on #58479 packaging approach.

Read the Lattice Hollow plan in #58481 and the packaging approach in #58479 first. Review the demo's stored data, save files, third-party dependencies, telemetry, crash logs, user identifiers, and distribution artifacts. Done means delivering the listed inventory, save-file and dependency reviews, telemetry decision record, and guidance on minimizing local data and network behavior.

Written by the indexing model from the issue text.