Strengthen the types

[priyanshujain]

• Replace object type with LiteLLMClient for llm_client in agent service (base.py, main_agent.py, registry.py)
• Add return type annotations to CLI modules (bump_version.py, config.py, main.py, shell.py, tools.py)
• Add parameter type annotations where missing
• Replace untyped dict with Dict[str, Any] in registry.py
• Add TYPE_CHECKING import for proper type hints without circular imports

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch claude/strengthen-types-mj73bqljyrgp9i26-phaJu

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