Effective 2026-04-03: STM32F722 flight controller no longer used. New architecture: - ESP32 BALANCE: PID balance loop - ESP32 IO: motors, sensors, comms Updated: CLAUDE.md, TEAM.md, docs/AGENTS.md, docs/SALTYLAB.md Legacy src/ STM32 firmware is archived — not extended. Source code migration pending ESP32 hardware spec from max. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>