Polish live workspace export layout

backend/tests/test_sprint66_live_workspace_smoke_polish.py

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+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[2]
+
+
+def test_export_handoff_cards_use_width_aware_grid() -> None:
+    css = (ROOT / "frontend" / "src" / "styles" / "app.css").read_text(encoding="utf-8")
+
+    assert ".handoff-action-grid" in css
+    assert "repeat(auto-fit, minmax(11rem, 1fr))" in css
+    assert ".export-center .handoff-readiness-grid" in css
+    assert "repeat(auto-fit, minmax(7.5rem, 1fr))" in css
+
+
+def test_live_workspace_smoke_artifacts_are_documented() -> None:
+    execution_log = (ROOT / "docs" / "CODEX_EXECUTION_LOG.md").read_text(encoding="utf-8")
+
+    assert "Sprint 66 Live workspace smoke polish" in execution_log
+    assert "desktop and mobile screenshots" in execution_log
+    assert "no console warnings/errors" in execution_log