feat: enable mock serial port via HACI_SERIAL_PORT and update logs

Co-authored-by: aider (openai/gpt-5) <aider@aider.chat>

docker-compose.yml

@@ -7,6 +7,7 @@ services:
     environment:
       - RUST_LOG=info
       - MOCK_TEENSY=1
+      - HACI_SERIAL_PORT=/dev/ttyACM0
     ports:
       - "8080:8080"
     volumes:

scripts/entrypoint.sh

@@ -20,6 +20,9 @@ if [ "${MOCK_TEENSY:-0}" = "1" ]; then
   done
   if [ ! -e /dev/ttyACM0 ]; then
     echo "[entrypoint] WARNING: Failed to create /dev/ttyACM0 (mock Teensy)" >&2
+  else
+    export HACI_SERIAL_PORT=/dev/ttyACM0
+    echo "[entrypoint] Using mock serial at $HACI_SERIAL_PORT" >&2
   fi
 fi
 

scripts/ltc_gen.sh

@@ -21,7 +21,7 @@ s=0
 f=0
 
 while true; do
-  printf "LOCK %02d:%02d:%02d;%02d %s\r\n" "$h" "$m" "$s" "$f" "$RATE_STR"
+  printf "[LOCK] %02d:%02d:%02d;%02d | %sfps\r\n" "$h" "$m" "$s" "$f" "$RATE_STR"
 
   # increment frame
   f=$((f+1))