test(data_plane): poll for eventual consistency in namespace describe-after-create tests

Backend returns 200 for create_namespace but the namespace may not be
immediately visible to describe_namespace on all replicas. Both
test_create_namespace_with_schema_rest (sync) and
test_namespace_crud_lifecycle_rest_async (async) called describe_namespace
immediately after create, hitting the consistency window and getting 404.
Replaced direct describe_namespace calls with poll_until / async_poll_until
(60s timeout) — the same pattern already used by adjacent tests for
record_count updates after upsert. Fixes CI-0041.

Author: jhamon

tests/integration/test_data_plane.py

@@ -1599,7 +1599,13 @@ def test_create_namespace_with_schema_rest(client: Pinecone, shared_index_dim2:
         assert created.record_count == 0  # new namespace has no vectors
 
         # describe_namespace returns the namespace as accessible (schema was accepted)
-        described = index.describe_namespace(name=ns_name)
+        # Poll for eventual consistency — backend may not expose the namespace immediately after create
+        described = poll_until(
+            query_fn=lambda: index.describe_namespace(name=ns_name),
+            check_fn=lambda r: isinstance(r, NamespaceDescription),
+            timeout=60,
+            description=f"namespace {ns_name} visible after create",
+        )
         assert isinstance(described, NamespaceDescription)
         assert described.name == ns_name
         assert isinstance(described.record_count, int)

tests/integration/test_data_plane_async.py

@@ -596,8 +596,13 @@ async def test_namespace_crud_lifecycle_rest_async(
         assert created.name == ns_name
         assert created.record_count == 0  # unified-ns-0002
 
-        # 2. Describe namespace — returns NamespaceDescription
-        described = await idx.describe_namespace(name=ns_name)
+        # 2. Describe namespace — poll for eventual consistency after create
+        described = await async_poll_until(
+            query_fn=lambda: idx.describe_namespace(name=ns_name),
+            check_fn=lambda r: isinstance(r, NamespaceDescription),
+            timeout=60,
+            description=f"namespace {ns_name} visible after create",
+        )
         assert isinstance(described, NamespaceDescription)
         assert described.name == ns_name
         assert isinstance(described.record_count, int)