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b5b11a2036
Incorporates hardware-specific learnings from caveman99's Meshtastic T-Echo Card support PR (meshtastic/firmware#10267), cross-referenced against LilyGo's official t_echo_card_config.h pinmap. Battery (critical): - Add BATTERY_MEASUREMENT_CONTROL pin P0.31 — gates the resistive voltage divider feeding AIN0. Without toggling this pin, battery ADC reads are invalid (floating divider input). - TechoCardBoard::getBatteryVoltage() now drives P0.31 HIGH before SAADC read and LOW after to avoid parasitic drain. Display (critical): - Add OLED_DISPLAY_OFFSET = 24 for the SSD1315 72×40 panel. The physical display is mapped at GDDRAM pages 3–7 (rows 24–63); SETDISPLAYOFFSET and SETMULTIPLEX commands are sent after display.begin() in target.cpp to shift the visible window. Power rail (high priority): - RT9080 3V3 LDO now gets a clean HIGH→LOW→HIGH reset cycle with 100ms dwell in board.begin(), preventing brown-out when LoRa TX fires at +22 dBm after a soft reset.