Main jtbd here:
a) clarify who/how a graph is being accessed and make the factory aware
of the `context` where relevant (and make it obvious when it is
available)
b) make it more clear when you can bypass / defer resources with
expensive lifespans (like MCp connections)
c) make auth access more type-safe.
Gives us room to add other information, like:
- langsmith distributed tracing information
---- old
Can start doing things like this:
```
def my_graph(runtime: ServerRuntime):
if runtime.ensure_user().permissions not in ("foo"):
raise ValueError("bar")
```
etc.
Points of expected confusion:
- You won't have a stream_writer in this context.
- This won't be an accessible object within the graph, only the graph
factory.
For maintainers, related draft PR int he server
https://github.com/langchain-ai/langgraph/pull/6774
