Add ESP firmware architecture and reference documentation.

Document UART command flow, ESP-NOW data paths, and module map for
developers without covering goTool; link from main/README.

Co-authored-by: Cursor <cursoragent@cursor.com>
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2026-05-31 15:55:32 +02:00
co-authored by Cursor
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ESP32-S3 firmware for Powerpod nodes. Master and slave devices run the **same binary**; role and ESP-NOW network are selected at boot via DIP switches and an I2C IO expander.
**Architektur & ESP-only Doku (ohne goTool):** [`../docs/ARCHITECTURE.md`](../docs/ARCHITECTURE.md) (Datenflüsse UART/Commands/ESP-NOW), [`../docs/DOCUMENTATION.md`](../docs/DOCUMENTATION.md) (vollständige Referenz).
## System overview
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