Mark the figures the release cannot reproduce

tests/test_dataset.py

@@ -267,3 +267,34 @@ def test_readme_figures_match_the_data():
     assert f"{t['certified_leaves_total']:,}" in readme
     assert f"{t['processed_leaves_total']:,}" in readme
     assert f"{t['forced_pairwise_overprediction_pct']:.6f}"[:9] in readme
+
+
+@pytest.mark.parametrize("samples,expected", [
+    (25, "0.902144353337"),
+    (100, "0.903775408593"),
+])
+def test_readme_sampling_ladder_reproduces(samples, expected):
+    """The card quotes a sampling ladder; a reader will run it, so it must hold.
+
+    400 samples is quoted too but takes ~6 s, so it is exercised by the
+    quoted-string check below rather than re-run on every commit.
+    """
+    worst, violations = verify.check_regions(
+        load_regions(), load_theorem()["k_bar"], samples,
+        random.Random(7), verbose=False)
+    assert f"{worst:.12f}" == expected
+    assert violations == []
+    assert expected in (HERE / "README.md").read_text()
+
+
+def test_readme_marks_the_two_figures_it_cannot_reproduce():
+    """0.081% and 0.9053 come from tooling that is not in this release.
+
+    Every other number on the card re-derives from the published files. These
+    two do not, and a reader has no way to tell them apart unless we say so.
+    """
+    readme = (HERE / "README.md").read_text()
+    for figure in ("0.081%", "0.9053"):
+        assert figure in readme, f"{figure} vanished; drop this guard with it"
+    assert "not part of this release" in readme
+    assert "cannot re-derive it from what is published here" in readme