fix: ensure script executability on every pull

git checkout/clone can lose +x bits. Move chmod to always
run in post-merge hook, not just when scripts/ changes.

.githooks/post-merge

@@ -9,6 +9,9 @@ if [ -z "$CHANGED" ]; then
     exit 0
 fi
 
+# Always ensure scripts are executable (git may lose +x on clone/checkout)
+sudo chmod +x "$REPO/scripts/"*.py "$REPO/scripts/"*.sh 2>/dev/null || true
+
 SYSTEMD_CHANGED=$(echo "$CHANGED" | grep -c "^system/" || true)
 SCRIPT_CHANGED=$(echo "$CHANGED" | grep -c "^scripts/" || true)
 SKETCH_CHANGED=$(echo "$CHANGED" | grep -c "^sketch/" || true)