Fix owner PID tracking: resolve grandparent to get actual harness PID

$PPID inside start-server.sh is the ephemeral shell the harness spawns
to run the script — it dies immediately when the script exits, causing
the server to shut down after ~60s. Now resolves grandparent PID via
`ps -o ppid= -p $PPID` to get the actual harness process (e.g. claude).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

skills/brainstorming/scripts/start-server.sh

@@ -88,16 +88,24 @@ fi
 
 cd "$SCRIPT_DIR"
 
+# Resolve the harness PID (grandparent of this script).
+# $PPID is the ephemeral shell the harness spawned to run us — it dies
+# when this script exits. The harness itself is $PPID's parent.
+OWNER_PID="$(ps -o ppid= -p "$PPID" 2>/dev/null | tr -d ' ')"
+if [[ -z "$OWNER_PID" || "$OWNER_PID" == "1" ]]; then
+  OWNER_PID="$PPID"
+fi
+
 # Foreground mode for environments that reap detached/background processes.
 if [[ "$FOREGROUND" == "true" ]]; then
   echo "$$" > "$PID_FILE"
-  env BRAINSTORM_DIR="$SCREEN_DIR" BRAINSTORM_HOST="$BIND_HOST" BRAINSTORM_URL_HOST="$URL_HOST" BRAINSTORM_OWNER_PID="$PPID" node server.js
+  env BRAINSTORM_DIR="$SCREEN_DIR" BRAINSTORM_HOST="$BIND_HOST" BRAINSTORM_URL_HOST="$URL_HOST" BRAINSTORM_OWNER_PID="$OWNER_PID" node server.js
   exit $?
 fi
 
 # Start server, capturing output to log file
 # Use nohup to survive shell exit; disown to remove from job table
-nohup env BRAINSTORM_DIR="$SCREEN_DIR" BRAINSTORM_HOST="$BIND_HOST" BRAINSTORM_URL_HOST="$URL_HOST" BRAINSTORM_OWNER_PID="$PPID" node server.js > "$LOG_FILE" 2>&1 &
+nohup env BRAINSTORM_DIR="$SCREEN_DIR" BRAINSTORM_HOST="$BIND_HOST" BRAINSTORM_URL_HOST="$URL_HOST" BRAINSTORM_OWNER_PID="$OWNER_PID" node server.js > "$LOG_FILE" 2>&1 &
 SERVER_PID=$!
 disown "$SERVER_PID" 2>/dev/null
 echo "$SERVER_PID" > "$PID_FILE"