fix(runtime): keep shared artifacts optional

tests/test_runtime_readiness.py

@@ -57,7 +57,11 @@ def test_runtime_readiness_reports_shared_store_and_bounded_cache(
     assert document["status"] == "ok"
     assert document["readiness"] == {
         "operational": True,
-        "production_shared_artifacts": True,
+        "optional_shared_artifacts": {
+            "required": False,
+            "configured": True,
+            "ready": True,
+        },
     }
     components = document["components"]
     assert isinstance(components, dict)
@@ -85,16 +89,47 @@ def test_runtime_readiness_exposes_offline_cache_only_mode(
     document = _document(tmp_path, gateway=gateway, reconciler=reconciler)
 
     assert document["ok"] is True
-    assert document["status"] == "degraded"
+    assert document["status"] == "ok"
     assert document["readiness"] == {
         "operational": True,
-        "production_shared_artifacts": False,
+        "optional_shared_artifacts": {
+            "required": False,
+            "configured": True,
+            "ready": False,
+        },
     }
     components = document["components"]
     assert isinstance(components, dict)
     assert components["artifact_store"]["status"] == "offline-cache-only"
 
 
+def test_runtime_readiness_treats_standalone_as_complete_local_contour(
+    tmp_path: Path,
+) -> None:
+    reconciler = BackgroundReconcilerReadiness()
+    reconciler.record_success()
+
+    document = _document(tmp_path, gateway=None, reconciler=reconciler)
+
+    assert document["ok"] is True
+    assert document["status"] == "ok"
+    assert document["readiness"] == {
+        "operational": True,
+        "optional_shared_artifacts": {
+            "required": False,
+            "configured": False,
+            "ready": False,
+        },
+    }
+    components = document["components"]
+    assert isinstance(components, dict)
+    assert components["artifact_store"] == {
+        "mode": "standalone",
+        "status": "not-configured",
+        "central_available": None,
+    }
+
+
 def test_runtime_readiness_fails_after_repeated_reconciler_errors(
     tmp_path: Path,
 ) -> None: