chore(ag-ui): add ag-ui to pydantic-ai-slim extras

Add ag-ui to the list of extras in pydantic-ai-slim to ensure that the
adapter_ag_ui package is included when installing pydantic-ai-slim with
all extras, fixing the issue where mkdocs fails to build due to
missing dependencies.

Author: stevenh

docs/ag-ui.md

@@ -50,23 +50,23 @@ You can run the example with:
 uvicorn agent_to_ag_ui:app --host 0.0.0.0 --port 8000
 ```
 
-This will expose the agent as an AG-UI server, and you can start sending requests to it.
-
-See more about [exposing PydanticAI agents as AG-UI servers](#pydanticai-agent-to-ag-ui-server).
+This will expose the agent as an AG-UI server, and you can start sending
+requests to it.
 
 ## Adapter AG UI
 
-**AdapterAGUI** is an adapter between PydanticAI agents and the AG-UI protocol
-written in Python.
+[AdapterAGUI][adapter_ag_ui.AdapterAGUI]is an adapter between PydanticAI agents
+and the AG-UI protocol written in Python.
 
 ### Design
 
 The adapter receives messages in the form of a
-[`RunAgentInput.state`](https://docs.ag-ui.com/sdk/js/core/types#runagentinput)
+[`RunAgentInput`](https://docs.ag-ui.com/sdk/js/core/types#runagentinput)
 which describes the details of a request being passed to the agent including
-messages and state. These are then translated to PydanticAI types, passed to the
-provided agent when then process the request. Results from the agent are then
-streamed back to the caller.
+messages and state. These are then converted to PydanticAI types, passed to the
+provided agent which then process the request. Results from the agent are
+converted from PydanticAI types to AG-UI events and streamed back to the caller
+as Server-Sent Events (SSE).
 
 A user request may require multiple round trips between client UI and PydanticAI
 server, depending on the tools and events needed.

pyproject.toml

@@ -46,7 +46,7 @@ requires-python = ">=3.9"
 
 [tool.hatch.metadata.hooks.uv-dynamic-versioning]
 dependencies = [
-    "pydantic-ai-slim[openai,vertexai,google,groq,anthropic,mistral,cohere,bedrock,cli,mcp,evals,a2a]=={{ version }}",
+    "pydantic-ai-slim[openai,vertexai,google,groq,anthropic,mistral,cohere,bedrock,cli,mcp,evals,a2a,ag-ui]=={{ version }}",
 ]
 
 [tool.hatch.metadata.hooks.uv-dynamic-versioning.optional-dependencies]