Ryan Malloy a425b4c324 Add OLED display support, standardize Serial0 for UART output
- Add SSD1306 128x64 OLED display with attenuation bar, dB readout,
  step counter, sweep indicator, and WiFi RSSI
- Switch all debug output to Serial0 (UART0 via CH343) for consistent
  serial comms when USB CDC is not used
- Remove unused USB.h includes from all source files
- Add development notes to CLAUDE.md (no stty, serial config docs)
2026-02-08 14:10:44 -07:00
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