chore(scripts): add mpremote ESP-NOW ch5 send helpers

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/mpremote_send_ch5.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Upload and run a device-side ESP-NOW sender script.
+# Default channel is 5 and default destination is broadcast.
+#
+# Usage:
+#   scripts/mpremote_send_ch5.sh [port] [dest_mac_hex] [payload_hex]
+#
+# Examples:
+#   scripts/mpremote_send_ch5.sh /dev/ttyACM0
+#   scripts/mpremote_send_ch5.sh /dev/ttyACM0 ffffffffffff 4c0501000000
+
+PORT="${1:-/dev/ttyACM0}"
+DEST_HEX="${2:-ffffffffffff}"
+PAYLOAD_HEX="${3:-4c0501000000}"
+CHANNEL=5
+DEVICE_SCRIPT="send_ch5.py"
+
+mpremote connect "${PORT}" fs cp "scripts/mpremote_send_ch5_device.py" ":${DEVICE_SCRIPT}"
+mpremote connect "${PORT}" exec "
+import ${DEVICE_SCRIPT%.*}
+${DEVICE_SCRIPT%.*}.send_once('${DEST_HEX}', '${PAYLOAD_HEX}', ${CHANNEL})
+"