verify(P2): user-facing ACDL→Nova sweep — 4-layer verify PASS + ship

VERIFY: structural — all user-facing strings Nova; behavioral — 79 tests
+ CI PASS; security — no creds; quality — new onboarding Nova-header test.
REQ-166 complete. Internal ship_phase.sh helper added.

---ci---
project: acdl
phase: 2
milestone: v1.16
status: complete
phase_role: execution
requirements:
  covered: [REQ-166]
  partial: []
---/ci---

tests/test_environment_check.py

@@ -31,6 +31,12 @@ class TestEnvironmentCheck:
         assert "state backend" in msg.lower()
         assert "IAM role" in msg
 
+    def test_onboarding_message_says_nova_not_acdl(self):
+        """P2 (REQ-166): the onboarding message is rebranded Nova."""
+        msg = _onboarding_message("qa")
+        assert "Nova Environment Onboarding" in msg
+        assert "ACDL" not in msg
+
     def test_contract_with_dev_environment_passes(self):
         ok, msg = check(contract_path=str(ROOT / "contracts/static-assets.yml"), root=ROOT)
         assert ok is True