Support self-serve Business ProLite accounts (#35785)

## What changed

- Recognize `self_serve_business_prolite` across authentication, account and rate-limit APIs, generated schemas, workspace classification, status display, cloud configuration gating, and usage-limit messaging.
- Keep the Python SDK's `PlanType` enum compatible with non-empty string values introduced by newer Codex runtimes while preserving its known constants.

## Testing

- Cover token parsing, account reads and notifications, backend rate-limit mapping, workspace behavior, error formatting, and Python SDK response coercion for the new plan value.

GitOrigin-RevId: 70bc17a7c4ba4028cb10e4333cc1f2ac64da361f

sdk/python/tests/test_client_rpc_methods.py

@@ -5,8 +5,12 @@ from pathlib import Path
 from openai_codex.client import CodexClient, _params_dict
 from openai_codex.generated.notification_registry import notification_turn_id
 from openai_codex.generated.v2_all import (
+    AccountRateLimitsUpdatedNotification,
+    AccountUpdatedNotification,
     AgentMessageDeltaNotification,
     ApprovalsReviewer,
+    GetAccountResponse,
+    PlanType,
     ReasoningEffort,
     ReasoningEffortOption,
     ThreadForkParams,
@@ -37,6 +41,38 @@ def test_generated_v2_bundle_has_single_shared_plan_type_definition() -> None:
     assert source.count("class PlanType(") == 1
 
 
+def test_plan_type_accepts_business_prolite_from_newer_runtime() -> None:
+    """New runtime plan values should remain typed when using a codex_bin override."""
+    plan_type = "self_serve_business_prolite"
+    response = GetAccountResponse.model_validate(
+        {
+            "account": {
+                "type": "chatgpt",
+                "email": "user@example.com",
+                "planType": plan_type,
+            },
+            "requiresOpenaiAuth": True,
+        }
+    )
+    assert response.account is not None
+    assert response.account.root.plan_type.value == plan_type
+
+    client = CodexClient()
+    account_updated = client._coerce_notification(
+        "account/updated",
+        {"authMode": "chatgpt", "planType": plan_type},
+    )
+    assert isinstance(account_updated.payload, AccountUpdatedNotification)
+    assert account_updated.payload.plan_type == PlanType(plan_type)
+
+    rate_limits_updated = client._coerce_notification(
+        "account/rateLimits/updated",
+        {"rateLimits": {"planType": plan_type}},
+    )
+    assert isinstance(rate_limits_updated.payload, AccountRateLimitsUpdatedNotification)
+    assert rate_limits_updated.payload.rate_limits.plan_type == PlanType(plan_type)
+
+
 def test_reasoning_effort_preserves_enum_constants_and_accepts_future_values() -> None:
     """Known effort members and new runtime values should share the enum-style API."""
     known_option = ReasoningEffortOption.model_validate(