no-mistakes(review): Fix compression example alias; make retired aliases fail audit

tests/test_audit_hermes_config_alias.py

@@ -87,3 +87,21 @@ def test_retired_gemma_is_rejected(tmp_path):
     assert code == 1, out
     assert "auxiliary.vision.model must be gpu-vision" in out
     assert "RESULT: FAIL" in out
+
+
+def test_retired_alias_in_delegation_is_rejected(tmp_path):
+    """delegation.model has no dedicated value rule, so a retired name there used to PASS."""
+    cfg = tmp_path / "delegation-gpu-light.yaml"
+    cfg.write_text(
+        BASE.format(alias="gpu-vision").replace(
+            "delegation:\n  provider: harness",
+            "delegation:\n  provider: harness\n  model: gpu-light",
+        )
+    )
+    proc = subprocess.run(
+        [sys.executable, str(AUDIT), str(cfg)],
+        capture_output=True, text=True,
+    )
+    assert proc.returncode == 1, proc.stdout
+    assert "delegation.model = 'gpu-light' is retired" in proc.stdout
+    assert "RESULT: FAIL" in proc.stdout