fix base costs and import backstage in ctm notebook

studies/202512_GenesysCX/ctm-token-calculator/tests/test_appendix4.py

@@ -106,3 +106,10 @@ def test_case_flows_and_kpis():
     inc2 = {y: -1.0 for y in a4.YEARS}
     net2 = {y: benefits[y] + 1.0 for y in a4.YEARS}
     assert a4.case_kpis(inc2, net2)["roi"] is None
+
+
+def test_contracted_overlays_verbatim():
+    assert a4.tco("ccaas_annual") == 3_200_000            # signed contract
+    assert a4.TCO_VERBATIM["ccaas_annual"] == 4_300_000   # deck record intact
+    assert a4.tco("current_annual") == a4.TCO_VERBATIM["current_annual"]
+    assert a4.licence_costs_by_year(12, a4.tco("ccaas_annual"))[2027] == 3_200_000

studies/202512_GenesysCX/ctm-token-calculator/tests/test_staging.py

@@ -0,0 +1,15 @@
+"""Stage/backstage detection — Mercury kernels carry MERCURY_CONFIG_DIR."""
+
+from tokencalc import staging
+
+
+def test_backstage_prints_only_off_stage(monkeypatch, capsys):
+    monkeypatch.delenv("MERCURY_CONFIG_DIR", raising=False)
+    assert not staging.on_stage()
+    staging.backstage("visible")
+    assert capsys.readouterr().out == "visible\n"
+
+    monkeypatch.setenv("MERCURY_CONFIG_DIR", "/tmp/app")
+    assert staging.on_stage()
+    staging.backstage("hidden")
+    assert capsys.readouterr().out == ""