…tion (#6330)

## Why are these changes needed?
This PR enhances the `SelectorGroupChat` class by introducing a new
`model_context` parameter to support more context-aware speaker
selection.

### Changes
- Added a `model_context: ChatCompletionContext | None` parameter to
`SelectorGroupChat`.
- Defaulted to `UnboundedChatCompletionContext` when None is provided
like `AssistantAgent`.
- Updated `_select_speaker` to prepend context messages from
`model_context` to the main thread history.
- Refactored history construction into a helper method
`construct_message_history`.

## Related issue number
Closes [Issue #6301](https://github.com/org/repo/issues/6301), enabling
the group chat manager to utilize `model_context` for richer, more
informed speaker selection decisions.

## Checks
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---------

Signed-off-by: Abhijeetsingh Meena <abhijeet040403@gmail.com>
Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>

## Why are these changes needed?

This pull request adds new samples that integrates the Autogen Core API
with Chainlit. It closely follows the structure of the
Agentchat+Chainlit sample and provides examples for using a single agent
and multiple agents in a groupchat.
## Related issue number


Closes: #5345

---------

Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>

## Related issue number

Closes #6486

Bump python version, pin nr-utils

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Fix docs build CI bug.
- pydocmkardown depends on pydocspec 
-[ pydocspec was updated May
6](https://pypi.org/project/docspec-python/#history) (two days ago), and
includes a problematic dependency (`nr.utils` which is specified as
[nr-utils](https://github.com/NiklasRosenstein/python-docspec/blob/61d3e38c55d290da6197236357e1cdfe818d35b5/docspec-python/pyproject.toml#L14C5-L14C23).
This caused imports to fail.
- current fix is fixing the pydocspec version.
- Also using the opportunity to update the python version 3.8 -> 3.9 for
the docs build 0.2

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## Why are these changes needed?

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solves. -->

## Related issue number

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build and test documentation locally.
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introduced in this PR.
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Add gpt 4o search models to list of default models

```python
"gpt-4o-mini-search-preview-2025-03-11": {
        "vision": False,
        "function_calling": True,
        "json_output": True,
        "family": ModelFamily.GPT_4O,
        "structured_output": True,
        "multiple_system_messages": True,
    },
"gpt-4o-search-preview-2025-03-11": {
        "vision": False,
        "function_calling": True,
        "json_output": True,
        "family": ModelFamily.GPT_4O,
        "structured_output": True,
        "multiple_system_messages": True,
    },
```

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## Why are these changes needed?

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solves. -->

## Related issue number

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Closes #6491

## Checks

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introduced in this PR.
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## Why are these changes needed?

This PR improves keyboard accessibility by ensuring that header
links/icons have visual feedback (underline and color change) on both
hover and keyboard focus states. Also adds smooth scaling animation.

## Related issue number

Related issue: #6090 

## Checks

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- [☑️] I've added tests (if relevant) corresponding to the changes
introduced in this PR.
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Co-authored-by: peterychang <49209570+peterychang@users.noreply.github.com>

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## Why are these changes needed?

Will the changes made in
https://github.com/microsoft/autogen/pull/5853/files and this PR need to
be ported to the worker_runtime as well?
Resolves #5894

## Related issue number

#5894

## Checks

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Some fixes with the AnthropicBedrockChatCompletionClient 

- Ensure `AnthropicBedrockChatCompletionClient` exported and can be
imported.
- Update the BedrockInfo keys serialization - client argument can be
string (similar to api key in this ) but exported config should be
Secret
- Replace `AnthropicBedrock` with `AsyncAnthropicBedrock` : client
should be async to work with the ag stack and the BaseAnthropicClient it
inherits from
- Improve `AnthropicBedrockChatCompletionClient` docstring to use the
correct client arguments rather than serialized dict format.

Expect

```python
from autogen_ext.models.anthropic import AnthropicBedrockChatCompletionClient, BedrockInfo
from autogen_core.models import UserMessage, ModelInfo


async def main():
    anthropic_client = AnthropicBedrockChatCompletionClient(
        model="anthropic.claude-3-5-sonnet-20240620-v1:0",
        temperature=0.1,
        model_info=ModelInfo(vision=False, function_calling=True,
                             json_output=False, family="unknown", structured_output=True),
        bedrock_info=BedrockInfo(
            aws_access_key="<aws_access_key>",
            aws_secret_key="<aws_secret_key>",
            aws_session_token="<aws_session_token>",
            aws_region="<aws_region>",
        ),
    )
    # type: ignore
    result = await anthropic_client.create([UserMessage(content="What is the capital of France?", source="user")])
    print(result)

await main()
```

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## Why are these changes needed?

<!-- Please give a short summary of the change and the problem this
solves. -->

## Related issue number

<!-- For example: "Closes #1234" -->

Closes #6483 

## Checks

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introduced in this PR.
- [ ] I've made sure all auto checks have passed.

---------

Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>

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## Why are these changes needed?
As-is: Deleting `McpWorkbench` does not close the `McpSession`.  
To-be: Deleting `McpWorkbench` now properly closes the `McpSession`.

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solves. -->

## Related issue number

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introduced in this PR.
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## Why are these changes needed?

Nice to have functionality

## Related issue number

Closes #6060 

## Checks

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---------

Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>

#6482)

…ized properly

## Why are these changes needed?
The exceptions thrown by MCP server tools weren't being serialized
properly - the user would see `[{}, {}, ... {}]` instead of an actual
error/exception message.

## Related issue number

Fixes #6481 

## Checks

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introduced in this PR.
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---------

Signed-off-by: Peter Jausovec <peter.jausovec@solo.io>
Co-authored-by: Victor Dibia <victordibia@microsoft.com>
Co-authored-by: Victor Dibia <victor.dibia@gmail.com>

## Why are these changes needed?
FIX/mistral could not recive name field, so add model transformer for
mistral

## Related issue number
Closes #6147

## Checks

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Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>

## Why are these changes needed?

Simplified the azure ai search tool and fixed bugs in the code


## Related issue number

"Closes #6430 " 

## Checks

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introduced in this PR.
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Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>