feat(docs): update README and AGENTS.md with RTK instructions

scripts/monitor-agent.sh

@@ -7,7 +7,12 @@
 #   - /tmp/doorbell-$BOARD-state.json - Current device state
 #   - /tmp/doorbell-$BOARD-cmd.fifo - Command pipe (echo 'cmd' > fifo)
 #
+# Note: This script should be run after 'mise run kill' to ensure
+#       any existing processes using the serial port are terminated.
+#
 # Usage:
+#   mise run kill BOARD=$BOARD
+#   ./scripts/monitor-agent.sh $BOARD
 #   tail -f /tmp/doorbell-$BOARD.jsonl           # Watch logs
 #   echo 'dashboard' > /tmp/doorbell-$BOARD-cmd.fifo  # Send command
 
@@ -15,9 +20,6 @@ set -euo pipefail
 
 BOARD="${1:-esp32-32e-4}"
 source "./boards/$BOARD/board-config.sh"
-source ./scripts/lockfile.sh
-
-acquire_lock || exit 1
 
 SERIAL="$PORT"
 LOGFILE="/tmp/doorbell-$BOARD.jsonl"