test(e2e): 52 asserts xim is NOT injected into project .xlings.json (matches fix)

The fake-xlings in 52_local_path_namespaced_index.sh asserted the OLD behavior
(project .xlings.json must contain the official xim index). Flip it: xim is a
global-default index and must NOT be injected project-scoped. Verified: e2e 52 OK.

Claude-Session: https://claude.ai/code/session_01Y3KE7MAE8yV7BG35eXy7FV

Author: Sunrisepeak

tests/e2e/52_local_path_namespaced_index.sh

@@ -134,8 +134,12 @@ if [[ "${1:-}" == "interface" && "${2:-}" == "install_packages" ]]; then
         fi
         shift
     done
-    if ! grep -q '"name": "xim"' "${XLINGS_PROJECT_DIR:?}/.xlings.json"; then
-        echo "missing official xim index in project .xlings.json" >&2
+    # The official global `xim` index must NOT be injected into the project's
+    # .xlings.json — it's a global-default index (global IS the default scope);
+    # injecting it project-scoped mis-scopes every xim:* tool into the project
+    # store. Only user-declared local custom indices belong here.
+    if grep -q '"name": "xim"' "${XLINGS_PROJECT_DIR:?}/.xlings.json"; then
+        echo "official xim index must NOT be injected into project .xlings.json" >&2
         cat "${XLINGS_PROJECT_DIR:?}/.xlings.json" >&2 2>/dev/null || true
         exit 24
     fi