# Platform Layer

Purpose: hardware and system resource abstraction only.

Allowed examples:
- Wi-Fi and board-level driver wrappers
- NVS/time/RTOS/system adapters
- board-specific IO and transport bindings

Rules:
- Expose stable APIs in `include/`.
- Keep private headers in `internal/`.
- Do not depend on `domain`, `control_plane`, or `app_composition`.