fix: address PR review comments

Guard the pgrep/ps snippet in the public skill so it does not error
when RocketSim is not running. Fix the repeated numbered list item in
the README Claude Code install instructions.

Author: AvdLee

Agent-Skill/SKILL.md

@@ -16,7 +16,11 @@ Developer machines can have multiple RocketSim installs side-by-side, such as an
 If RocketSim is already running, prefer that app bundle first:
 
 ```bash
-APP_PATH="$(ps -o command= -p "$(pgrep -x RocketSim | head -1)" | sed 's#/Contents/MacOS/RocketSim$##')"
+ROCKETSIM_PID="$(pgrep -x RocketSim | head -1)"
+APP_PATH=""
+if [ -n "$ROCKETSIM_PID" ]; then
+  APP_PATH="$(ps -o command= -p "$ROCKETSIM_PID" | sed 's#/Contents/MacOS/RocketSim$##')"
+fi
 printf '%s\n' "$APP_PATH"
 ```
 

README.md

@@ -65,7 +65,7 @@ To install this skill for your personal use in Claude Code:
 /plugin marketplace add AvdLee/RocketSimApp
 ```
 
-1. Install the skill:
+2. Install the skill:
 
 ```bash
 /plugin install rocketsim@rocketsim