Fail the same way on JSON of an unexpected shape

json.loads succeeding does not mean the result is a list of objects with an
id. A dict, an entry without an id, or a scalar raised TypeError or KeyError,
which escaped unhandled and defeated the point of the change. Both cases now
raise DaemonError, and the original exception is chained so the cause is
visible.

tests/test_commands.py

@@ -213,3 +213,25 @@ def test_local_libraries_reports_a_failed_command(client, monkeypatch):
     run_returning(monkeypatch, b"", returncode=1)
     with pytest.raises(DaemonError):
         client.get_local_libraries()
+
+
+@pytest.mark.parametrize("payload", [
+    b'{"name": "Docs"}',            # an object where a list is expected
+    b'[{"name": "Docs"}]',          # an entry with no id
+    b'["Docs"]',                    # entries that are not objects
+    b'[null]',
+    b'null',
+    b'42',
+])
+def test_local_libraries_reports_unexpected_json_shapes(client, monkeypatch, payload):
+    """Valid JSON of the wrong shape must not escape as a raw TypeError."""
+    run_returning(monkeypatch, payload)
+    with pytest.raises(DaemonError):
+        client.get_local_libraries()
+
+
+def test_local_libraries_error_keeps_the_original_cause(client, monkeypatch):
+    run_returning(monkeypatch, b"not json at all")
+    with pytest.raises(DaemonError) as err:
+        client.get_local_libraries()
+    assert err.value.__cause__ is not None