feat: add debug logging for session directory and file in review script

Includes additional diagnostic outputs for PI_DEBUG mode: contents of the session directory and the selected session file.

scripts/review.sh

@@ -255,9 +255,14 @@ if [ ! -s /tmp/pi-review.md ]; then
   exit 1
 fi
 
+echo "Debug mode: PI_DEBUG=${PI_DEBUG}"
+
 # If debug mode, extract tool calls from session and append to review
 if [ "${PI_DEBUG}" = "true" ]; then
+  echo "Session dir contents:"
+  find /tmp/pi-session -type f 2>/dev/null || echo "  (none)"
   SESSION_FILE=$(find /tmp/pi-session -name '*.jsonl' -type f 2>/dev/null | head -1)
+  echo "Session file: ${SESSION_FILE:-<none found>}"
   TOOL_LOG=""
 
   if [ -n "${SESSION_FILE}" ]; then