docs: add guide for managing user context with Store

Add comprehensive documentation for managing user preferences using LangGraph Store and static runtime context pattern.

- Demonstrate Store + Static Context integration
- Cover loading, updating, and dynamic field patterns

Author: jjhpka

reference/python/docs/langchain/agents.md

@@ -2,6 +2,7 @@
 <!-- (`group_by_category orders `AgentState` (a class) before functions) -->
 ::: langchain.agents
     options:
+      summary: false
       group_by_category: false
       parameter_headings: true
       members:

reference/python/docs/langchain/embeddings.md

@@ -2,6 +2,7 @@
 <!-- (`group_by_category orders `Embeddings` (a class) before functions) -->
 ::: langchain.embeddings
     options:
+      summary: false
       group_by_category: false
       members:
         - init_embeddings

reference/python/docs/langchain/models.md

@@ -3,5 +3,6 @@
 ::: langchain.chat_models
     options:
       parameter_headings: true
+      summary: false
       members:
         - init_chat_model

reference/python/docs/langchain_core/documents.md

@@ -1,3 +1,6 @@
-::: langchain_core.documents.base.BaseMedia
-::: langchain_core.documents.base.Blob
+::: langchain_core.documents
+    options:
+      members: []
 ::: langchain_core.documents.base.Document
+::: langchain_core.documents.base.Blob
+::: langchain_core.documents.base.BaseMedia

reference/python/docs/langchain_core/language_models.md

@@ -1,8 +1,5 @@
 <!-- `members: []` in order to show module docstring -->
 ::: langchain_core.language_models
-    options:
-      members: []
-::: langchain_core.language_models.chat_models
     options:
       parameter_headings: true
       show_inheritance_diagram: true

reference/python/mkdocs.yml

@@ -228,6 +228,7 @@ plugins:
               # Preload modules before collecting documentation to enable cross-references
               - langchain
               - langchain_core
+              - langgraph
               - langsmith
 
             # Generate objects.inv file for this site to enable cross-referencing from other sites

reference/python/uv.lock

@@ -179,7 +179,8 @@
                       "oss/python/langchain/human-in-the-loop",
                       "oss/python/langchain/multi-agent",
                       "oss/python/langchain/retrieval",
-                      "oss/python/langchain/long-term-memory"
+                      "oss/python/langchain/long-term-memory",
+                      "oss/python/langchain/manage-user-context"
                     ]
                   },
                   {
@@ -516,7 +517,8 @@
                       "oss/javascript/langchain/human-in-the-loop",
                       "oss/javascript/langchain/multi-agent",
                       "oss/javascript/langchain/retrieval",
-                      "oss/javascript/langchain/long-term-memory"
+                      "oss/javascript/langchain/long-term-memory",
+                      "oss/javascript/langchain/manage-user-context"
                     ]
                   },
                   {