ci: use fast benchmark (#4017)

## Description

I noticed a very minor issue in the formatting of the Concepts > Pregel
doc:
(https://langchain-ai.github.io/langgraph/concepts/pregel/#high-level-api)
(https://github.com/langchain-ai/langgraph/blob/main/docs/docs/concepts/pregel.md)

You can see in the image below that there is a python codeblock, then a
pycon block, and inside that block there is an extra
triple-backtick/code fence, and then text at the bottom, which it
appears like it is supposed to be a separate python block, like the one
above it. I.e., clearly:

```
```python
print(graph.channels)
```

is intended to be:

```python
print(graph.channels)
```

I'm pretty sure this is due to an extra whitespace character before the preceding closing code fence, which is throwing off the formatting.


![image](https://github.com/user-attachments/assets/616d72d6-652b-4599-be3e-55c47766861d)

My VS-Code/extensions can't really render the Markdown the way it appears on the Website, I think because of the tabs (Graph API vs. Functional API), but I noticed that if I remove the extra whitespace, the highlighting on the python codeblock is corrected:

BEFORE:
<img width="605" alt="Screenshot 2025-03-25 at 5 02 41 PM" src="https://github.com/user-attachments/assets/8474f103-c5ab-4c02-b22f-3d54b3363331" />

AFTER:
<img width="277" alt="Screenshot 2025-03-25 at 5 02 50 PM" src="https://github.com/user-attachments/assets/a311b87b-859c-4aba-a4d8-6b063a155d90" />


## Fix
* Remove one whitespace character that was throwing off markdown rendering

.github/workflows/bench.yml

@@ -43,7 +43,7 @@ jobs:
         run: |
           {
             echo 'OUTPUT<<EOF'
-            make -s benchmark
+            make -s benchmark-fast
             echo EOF
           } >> "$GITHUB_OUTPUT"
       - name: Compare benchmarks

docs/_scripts/third_party_page/packages.yml

@@ -36,6 +36,3 @@ packages:
   - name: "langgraph-reflection"
     repo: "langchain-ai/langgraph-reflection"
     description: "LangGraph agent that runs a reflection step."
-  - name: "langmanus"
-    repo: "langmanus/langmanus"
-    description: "A community-driven AI automation framework that builds upon the incredible work of the open source community. Our goal is to combine language models with specialized tools for tasks like web search, crawling, and Python code execution, while giving back to the community that made this possible."

docs/docs/concepts/pregel.md

@@ -284,7 +284,7 @@ LangGraph provides two high-level APIs for creating a Pregel application: the [S
     {'__start__': <langgraph.pregel.read.PregelNode at 0x7d05e3ba1810>,
      'write_essay': <langgraph.pregel.read.PregelNode at 0x7d05e3ba14d0>,
      'score_essay': <langgraph.pregel.read.PregelNode at 0x7d05e3ba1710>}
-     ```
+    ```
 
     ```python
     print(graph.channels)
@@ -344,4 +344,4 @@ LangGraph provides two high-level APIs for creating a Pregel application: the [S
     {'write_essay': <langgraph.pregel.read.PregelNode object at 0x7d05e2f9aad0>}
     Channels: 
     {'__start__': <langgraph.channels.ephemeral_value.EphemeralValue object at 0x7d05e2c906c0>, '__end__': <langgraph.channels.last_value.LastValue object at 0x7d05e2c90c40>, '__previous__': <langgraph.channels.last_value.LastValue object at 0x7d05e1007280>}
-    ```
+    ```

libs/langgraph/langgraph/graph/graph.py

@@ -499,6 +499,11 @@ class CompiledGraph(Pregel):
         ) -> None:
             if end == END and END not in end_nodes:
                 end_nodes[END] = graph.add_node(self.get_output_schema(config), END)
+            if start not in start_nodes or end not in end_nodes:
+                logger.warning(
+                    f"Could not add edge from '{start}' to '{end}' due to missing nodes"
+                )
+                return
             return graph.add_edge(
                 start_nodes[start],
                 end_nodes[end],

libs/sdk-py/pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "langgraph-sdk"
-version = "0.1.58"
+version = "0.1.59"
 description = "SDK for interacting with LangGraph API"
 authors = []
 license = "MIT"