chore(scripts): make todo-check respect loop env

Allow ROBOPPI_TODO_PATH/ROBOPPI_LOOP_DIR overrides and prefer legacy .agentcore-loop when present.

Author: reoring

scripts/agent-pr-loop/todo-check.sh

@@ -1,10 +1,21 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-LOOP_DIR=.roboppi-loop
+DEFAULT_LOOP_DIR=.roboppi-loop
 
-TODO="${LOOP_DIR}/todo.md"
-test -s "${TODO}" || { echo "CHECK: missing todo"; exit 1; }
+# Allow workflows to override where loop artifacts live.
+# Compatibility: prefer .agentcore-loop when present (older loop layout).
+if [ -n "${ROBOPPI_TODO_PATH:-}" ]; then
+  TODO="${ROBOPPI_TODO_PATH}"
+elif [ -n "${ROBOPPI_LOOP_DIR:-}" ]; then
+  TODO="${ROBOPPI_LOOP_DIR}/todo.md"
+elif [ -s ".agentcore-loop/todo.md" ] && [ ! -s "${DEFAULT_LOOP_DIR}/todo.md" ]; then
+  TODO=".agentcore-loop/todo.md"
+else
+  TODO="${DEFAULT_LOOP_DIR}/todo.md"
+fi
+
+test -s "${TODO}" || { echo "CHECK: missing todo: ${TODO}"; exit 1; }
 
 COUNT=$(grep -c '^- \[ \] ' "${TODO}" || true)
 if [ "${COUNT}" -lt 6 ]; then