docs: refresh langgraph install guidance

Author: blove

apps/website/content/AGENTS.md.template

@@ -3,7 +3,7 @@
 Production-ready chat, durable threads, interrupts, subagents, planning, memory, and generative UI for Angular agent apps.
 
 ## Install
-npm install @threadplane/chat @threadplane/langgraph
+npm install @threadplane/chat @threadplane/langgraph @langchain/core @langchain/langgraph-sdk marked
 
 ## Key requirement
 `injectAgent()` MUST be called within an Angular injection context (component constructor or field initializer). Calling it in ngOnInit or any async context throws "NG0203: inject() must be called from an injection context".

apps/website/content/CLAUDE.md.template

@@ -3,7 +3,7 @@
 Production-ready chat, durable threads, interrupts, subagents, planning, memory, and generative UI for Angular agent apps.
 
 ## Install
-npm install @threadplane/chat @threadplane/langgraph
+npm install @threadplane/chat @threadplane/langgraph @langchain/core @langchain/langgraph-sdk marked
 
 ## Key requirement
 `injectAgent()` MUST be called within an Angular injection context (component constructor or field initializer). Calling it in ngOnInit or any async context throws "NG0203: inject() must be called from an injection context".

apps/website/content/docs/chat/getting-started/installation.mdx

@@ -33,7 +33,7 @@ Install `@threadplane/chat`, your chosen runtime adapter, and the `marked` markd
 
 ```bash
 # LangGraph backends
-npm install @threadplane/chat @threadplane/langgraph marked
+npm install @threadplane/chat @threadplane/langgraph @langchain/core @langchain/langgraph-sdk marked
 
 # AG-UI compatible backends
 npm install @threadplane/chat @threadplane/ag-ui @ag-ui/client @ag-ui/core marked

apps/website/content/docs/chat/getting-started/quickstart.mdx

@@ -18,10 +18,10 @@ Evaluating? No license needed — the chat runs without a token (with a one-time
 <Step title="Install the package">
 
 ```bash
-npm install @threadplane/chat @threadplane/langgraph marked
+npm install @threadplane/chat @threadplane/langgraph @langchain/core @langchain/langgraph-sdk marked
 ```
 
-`@threadplane/langgraph` provides the adapter used by the provider snippet below. `marked` is the markdown renderer used for assistant messages.
+`@threadplane/langgraph` provides the adapter used by the provider snippet below. The LangChain packages are required peers for that adapter, and `marked` is the markdown renderer used for assistant messages.
 
 </Step>
 <Step title="Configure providers">

apps/website/content/docs/langgraph/api/api-docs.json

@@ -2524,7 +2524,7 @@
       "description": ""
     },
     "examples": [
-      "```ts\nTestBed.configureTestingModule({\n  providers: [provideFakeAgent({ responses: ['Hi from the fake LangGraph agent'] })],\n});\n```"
+      "```ts\nTestBed.configureTestingModule({\n  providers: [provideFakeAgent({ tokens: ['Hi from the fake LangGraph agent'] })],\n});\n```"
     ]
   },
   {

apps/website/content/docs/langgraph/getting-started/installation.mdx

@@ -19,10 +19,10 @@ A running LangGraph agent reachable over HTTP. Local (`langgraph dev`) or deploy
 ## Install the package
 
 ```bash
-npm install @threadplane/langgraph @threadplane/chat
+npm install @threadplane/langgraph @threadplane/chat @langchain/core @langchain/langgraph-sdk
 ```
 
-`@threadplane/langgraph` provides `injectAgent()` and `provideAgent()`. `@threadplane/chat` provides the runtime-neutral chat UI consumed by the LangGraph adapter.
+`@threadplane/langgraph` provides `injectAgent()` and `provideAgent()`. `@threadplane/chat` provides the runtime-neutral chat UI consumed by the LangGraph adapter. The LangChain packages are required peers used by the adapter's message types and LangGraph SDK client.
 
 ## Peer Dependencies
 

apps/website/content/docs/langgraph/getting-started/introduction.mdx

@@ -129,7 +129,7 @@ Now connect your Angular app to the running agent using `injectAgent()`.
 <Step title="Install the package">
 
 ```bash
-npm install @threadplane/langgraph
+npm install @threadplane/langgraph @threadplane/chat @langchain/core @langchain/langgraph-sdk
 ```
 
 </Step>

apps/website/content/docs/langgraph/getting-started/quickstart.mdx

@@ -10,10 +10,10 @@ Angular 20+ project with Node.js 18+. If you need setup help, see the [Installat
 <Step title="Install the package">
 
 ```bash
-npm install @threadplane/langgraph @threadplane/chat
+npm install @threadplane/langgraph @threadplane/chat @langchain/core @langchain/langgraph-sdk
 ```
 
-Most npm clients install peer dependencies automatically. Strict package managers may also ask you to install the Angular, LangChain, and LangGraph SDK peers listed in the [Installation](/docs/langgraph/getting-started/installation) guide.
+Most npm clients install peer dependencies automatically. Listing the LangChain peers explicitly keeps strict package managers quiet. They may still ask you to install the Angular and RxJS peers listed in the [Installation](/docs/langgraph/getting-started/installation) guide if your app does not already provide them.
 
 </Step>
 <Step title="Configure the provider">

apps/website/content/prompts/getting-started.md

@@ -1,6 +1,6 @@
 Add angular to my Angular 20+ application.
 
-Install: npm install @threadplane/chat @threadplane/langgraph
+Install: npm install @threadplane/chat @threadplane/langgraph @langchain/core @langchain/langgraph-sdk marked
 
 1. In app.config.ts, add provideAgent({ apiUrl: 'http://localhost:2024', assistantId: 'chat' }) to the providers array. Import it from '@threadplane/langgraph'.
 

apps/website/public/AGENTS.md

@@ -3,7 +3,7 @@
 Production-ready chat, durable threads, interrupts, subagents, planning, memory, and generative UI for Angular agent apps.
 
 ## Install
-npm install @threadplane/chat @threadplane/langgraph
+npm install @threadplane/chat @threadplane/langgraph @langchain/core @langchain/langgraph-sdk marked
 
 ## Key requirement
 `injectAgent()` MUST be called within an Angular injection context (component constructor or field initializer). Calling it in ngOnInit or any async context throws "NG0203: inject() must be called from an injection context".