chore: remove esp32 firmware tree and dev mpremote helper

Made-with: Cursor

scripts/cp-esp32-main.sh

@@ -1,4 +0,0 @@
-#!/usr/bin/env bash
-# Copy esp32/main.py to the connected ESP32 as /main.py (single line, no wrap).
-cd "$(dirname "$0")/.."
-pipenv run mpremote fs cp esp32/main.py :/main.py