Update README and StateManager for Graph Store enhancements

- Revised the README to clarify the Graph Store's functionality, specifying it as a strings-only key-value store with per-run scope.
- Modified the StateManager to conditionally include retry policy and store configuration in the request body, improving flexibility in handling graph execution parameters.

Author: NiveditJain

python-sdk/README.md

@@ -77,7 +77,7 @@ export EXOSPHERE_API_KEY="your-api-key"
 - **Async Support**: Native async/await support for high-performance operations
 - **Error Handling**: Built-in retry mechanisms and error recovery
 - **Scalability**: Designed for high-volume batch processing and workflows
-- **Graph Store (beta)**: Persist key-value pairs across nodes within a single run
+- **Graph Store (beta)**: Strings-only key-value store with per-run scope for sharing data across nodes (not durable across separate runs or clusters)
 
 ## Architecture
 
@@ -256,12 +256,15 @@ result = await state_manager.trigger(
 ```
 
 **Parameters:**
+
 - `graph_name` (str): Name of the graph to execute
 - `inputs` (dict[str, str] | None): Key/value inputs for the first node (strings only)
 - `store` (dict[str, str] | None): Graph-level key/value store (beta) persisted across nodes
 
 **Returns:**
+
 - `dict`: JSON payload from the state manager
 
 **Raises:**
+
 - `Exception`: If the HTTP request fails

python-sdk/exospherehost/statemanager.py

@@ -189,10 +189,14 @@ async def upsert_graph(self, graph_name: str, graph_nodes: list[dict[str, Any]],
         }
         body = {
             "secrets": secrets,
-            "nodes": graph_nodes,
-            "retry_policy": retry_policy,
-            "store_config": store_config
+            "nodes": graph_nodes
         }
+
+        if retry_policy is not None:
+            body["retry_policy"] = retry_policy
+        if store_config is not None:
+            body["store_config"] = store_config
+
         async with aiohttp.ClientSession() as session:
             async with session.put(endpoint, json=body, headers=headers) as response: # type: ignore
                 if response.status not in [200, 201]: