Keep integration imports lightweight

tests/test_integrations_import_lightweight.py

@@ -0,0 +1,25 @@
+import json
+import os
+import subprocess
+import sys
+
+
+def test_integrations_import_does_not_initialize_core_package():
+    env = dict(os.environ)
+    env["PYTHONPATH"] = os.getcwd()
+    code = (
+        "import json, sys; "
+        "import src.integrations; "
+        "import src.secret_storage; "
+        "print(json.dumps({'core_loaded': 'core' in sys.modules}))"
+    )
+    result = subprocess.run(
+        [sys.executable, "-c", code],
+        cwd=os.getcwd(),
+        env=env,
+        text=True,
+        capture_output=True,
+        timeout=10,
+        check=True,
+    )
+    assert json.loads(result.stdout) == {"core_loaded": False}