fix(shell-docs): retarget residual broken cross-links uncovered by visual QA

Follow-up to the docs cross-link sweep — visual QA surfaced four more sets
of broken links that the framework-scope middleware was rewriting into 404s
(or that resolved against the wrong path due to relative-link ambiguity).

- agentic-protocols/index.mdx: switch ./ag-ui, ./mcp, and ./a2a to absolute
  /agentic-protocols/* paths so they resolve regardless of trailing slash.
- faq.mdx: drop link wrapping on the three "Rich agentic experiences" row
  labels (Deep support for LangChain, Human-in-the-loop, Shared state).
  The /langgraph/* slugs were docs.copilotkit.ai legacy paths that don't
  exist in shell-docs; matches the playbook used for the V1 reference rows.
- integrations/langgraph/agent-app-context.mdx: retarget the "Frontend Data
  documentation" Callout link from /langgraph/agent-app-context to
  /langgraph-python/agent-app-context (the working slug).
- inspector.mdx: retarget the useAgentContext link in the Context row from
  /langgraph/agent-app-context to /langgraph-python/agent-app-context.

Author: samjulien

showcase/shell-docs/src/content/docs/agentic-protocols/index.mdx

@@ -75,7 +75,7 @@ Learn about these protocols and how to connect your app to agents which support
           verticalAlign: "top",
         }}
       >
-        <a href="./ag-ui">
+        <a href="/agentic-protocols/ag-ui">
           <strong>AG-UI</strong>
         </a>
         <br />
@@ -103,7 +103,7 @@ Learn about these protocols and how to connect your app to agents which support
           verticalAlign: "top",
         }}
       >
-        <a href="./mcp">
+        <a href="/agentic-protocols/mcp">
           <strong>MCP</strong>
         </a>
         <br />
@@ -131,7 +131,7 @@ Learn about these protocols and how to connect your app to agents which support
           verticalAlign: "top",
         }}
       >
-        <a href="./a2a">
+        <a href="/agentic-protocols/a2a">
           <strong>A2A</strong>
         </a>
         <br />

showcase/shell-docs/src/content/docs/faq.mdx

@@ -58,9 +58,9 @@ We've got answers to some common questions!
     Integrate your LangChain agents into your product with ease.
     | |  |
     |---------|-------------|
-    | [**Deep support for LangChain**](/langgraph/quickstart) | Bring your LangChain agents directly into your product |
-    | [**Human-in-the-loop**](/langgraph/human-in-the-loop) | Allow your users to work with your agents to solve complex problems |
-    | [**Shared state**](/langgraph/shared-state) | Render the state of your LangChain agents with less than 10 lines of code |
+    | **Deep support for LangChain** | Bring your LangChain agents directly into your product |
+    | **Human-in-the-loop** | Allow your users to work with your agents to solve complex problems |
+    | **Shared state** | Render the state of your LangChain agents with less than 10 lines of code |
 
   </Accordion>
   <Accordion title="How does it all work?">

showcase/shell-docs/src/content/docs/inspector.mdx

@@ -24,7 +24,7 @@ The **CopilotKit Inspector** is a built-in debugging overlay that sits on top of
 | **Available Agents** | Which agents CopilotKit has discovered via `/info` and which one is currently active. |
 | **Agent State** | The current `agent.state` tree, rerendered as it updates. Great for debugging [shared state](./shared-state) flows. |
 | **Frontend Tools** | Every tool registered via `useFrontendTool`, `useComponent`, `useHumanInTheLoop`, or `useRenderTool`, along with its parameter schema. |
-| **Context** | The [`useAgentContext`](/langgraph/agent-app-context) entries the agent currently receives, plus any document context you've attached. |
+| **Context** | The [`useAgentContext`](/langgraph-python/agent-app-context) entries the agent currently receives, plus any document context you've attached. |
 
 ## When should I use it?
 

showcase/shell-docs/src/content/docs/integrations/langgraph/agent-app-context.mdx

@@ -12,7 +12,7 @@ This context can then be shared with your LangGraph agent.
 
 ## Implementation
 <Callout>
-    Check out the [Frontend Data documentation](/langgraph/agent-app-context) to understand what this is and how to use it.
+    Check out the [Frontend Data documentation](/langgraph-python/agent-app-context) to understand what this is and how to use it.
 </Callout>
 
 <TailoredContent