Move the v0.2 showcase into its own runbook directory so the UI can open it

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Assistant: claude-code
Assistant-Model: sonnet
Assistant-Process: 295952@bnt-lap001
Assistant-Session: e93f64ad-516c-46eb-9666-aad8d300c477

tests/test_ui_v2.py

@@ -18,7 +18,7 @@ _scratch = []
 @pytest.fixture
 def s2(tmp_path):
     d = tmp_path / "runbooks" / "lh"; d.mkdir(parents=True)
-    shutil.copy(ROOT / "runbooks/showcase-lighthouse/pack.v0.2.yaml", d / "pack.yaml")
+    shutil.copy(ROOT / "runbooks/showcase-lighthouse-v2/pack.yaml", d / "pack.yaml")
     s = ui.serve([tmp_path], 0)
     threading.Thread(target=s.serve_forever, daemon=True).start()
     yield s