Refactor agent factory

[assada]

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[Copilot]

Pull Request Overview

This PR refactors the agent factory by introducing resolver pattern for checkpointers and prompt providers, replacing direct instantiation and factory functions with centralized resolution logic.

• Introduces CheckpointerResolver and PromptProviderResolver classes to handle runtime resolution of checkpointers and prompt providers
• Removes the old create_checkpointer function and create_prompt_provider function in favor of resolver-based approach
• Updates agent configuration to include checkpoint type and modifies prompt directory configuration

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
app/container.py	Replaces checkpointer factory function with resolver and adds prompt provider resolver to dependency injection
app/bootstrap/config.py	Adds prompt_root_dir configuration field with default value
app/agent/prompt_resolver.py	New resolver class for managing prompt provider creation based on source type
app/agent/prompt.py	Updates default prompt directory and removes old factory function
app/agent/langgraph/graph.py	Removes TODO comment
app/agent/factory.py	Refactors agent creation to use resolver pattern instead of direct instantiation
app/agent/config.py	Updates agent config to use checkpoint_type and removes prompt_dir field

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