Support for chat context

[pmenendz]

• Support chat context
• Allow checkpointer None

[Copilot]

Pull Request Overview

Adds support for passing chat context messages to the agent and makes the checkpointing mechanism configurable (including allowing no checkpointer).

• Introduce checkpointer property in Config to select or disable a saver
• Remove hardcoded in-memory saver in the agent and wire through the config
• Add get_response_with_context to reuse streaming logic with arbitrary message history

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/expert/config.py	Add checkpointer property to select/disable savers
src/expert/agent.py	Remove hardcoded InMemorySaver, inject config checkpointer, add context-aware methods

Comments suppressed due to low confidence (1)

src/expert/config.py:108

• New match-case branches for the checkpointer configuration ('memory' and None) are introduced but not covered by existing tests. Consider adding unit tests to verify each branch behaves as expected.

        match checkpointer: