feat(admin-config-tool): task 1.1 - xceadmin package skeleton

Editable-installable xceadmin package with a real click-group entry
point (zero subcommands yet) and xcecommon as an independently
importable standalone package.

Requirements: 5.4

src/xceadmin/tests/test_cli.py

@@ -0,0 +1,44 @@
+"""Tests for the xceadmin package skeleton (task 1.1).
+
+Covers Requirement 5.4: xcecommon is importable as a standalone package
+independent of xceadmin's CLI, and the xceadmin console-script entry point
+is backed by a genuinely working (if currently empty) click group.
+"""
+
+from click.testing import CliRunner
+
+from xceadmin.cli import cli
+
+
+def test_cli_help_exits_zero() -> None:
+    """`xceadmin --help` must run cleanly and print usage text."""
+    runner = CliRunner()
+    result = runner.invoke(cli, ["--help"])
+
+    assert result.exit_code == 0
+    assert "Usage:" in result.output
+
+
+def test_cli_help_shows_zero_commands() -> None:
+    """The click group has no subcommands yet (config build/push land later)."""
+    runner = CliRunner()
+    result = runner.invoke(cli, ["--help"])
+
+    assert result.exit_code == 0
+    assert "Commands:" not in result.output
+
+
+def test_cli_group_invoked_with_no_args_does_not_traceback() -> None:
+    """Invoking the bare group with no subcommand exits cleanly via click's
+    own SystemExit (no subcommand registered yet), not an unhandled
+    traceback from application code."""
+    runner = CliRunner()
+    result = runner.invoke(cli, [])
+
+    assert isinstance(result.exception, SystemExit)
+    assert "Usage:" in result.output
+
+
+def test_xcecommon_is_importable_independent_of_xceadmin() -> None:
+    """xcecommon must be importable on its own, with no xceadmin import."""
+    import xcecommon  # noqa: F401 - import success is the assertion