swaitsandClaude Opus 4.6
110172ded7
- Add heltec_v4 board: ESP32-S3R2, SX1262, SSD1315 display, native USB, Vext on GPIO36 (active HIGH) - Wire up heltec_v3 with real esp-hal peripherals (was a stub) - V3 and V4 share radio/I2C pins, differ in Vext pin/polarity and display reset - Restructure main.rs: cfg_if selects embassy_executor::main (Cortex-M) vs esp_hal_embassy::main (Xtensa) per board - Display detection via SSD1306 init in display_task — boards always provide I2C bus, task exits gracefully if no display responds Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>