[JULES] fix(types): Add return type annotations to public methods - TYPE-005

[JuanCS-Dev]

Problem

Several public methods lack return type annotations, reducing code clarity and IDE support.

Scope (LIMITED)

Add return type annotations to public methods in these 3 specific files only:

1. vertice_cli/handlers/llm_processing_handler.py
2. vertice_cli/handlers/tool_execution_handler.py
3. vertice_cli/core/session_manager/storage.py

Requirements

• Add return type hints to all public methods (not starting with _)
• Use appropriate types from typing module (Optional, List, Dict, etc.)
• Follow existing type annotation patterns in the codebase
• Ensure type hints are accurate based on actual return values

Acceptance Criteria

• All public methods have return type annotations
• Type hints are accurate and match actual returns
• No new type errors introduced (run: python -m py_compile <file>)
• Tests still pass

Out of Scope

• Do NOT modify private methods (starting with _)
• Do NOT modify other files
• Do NOT change method logic

[google-labs-jules]

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[google-labs-jules]

You are currently at your limit of 15 tasks in 24 hours. This issue can be reassigned once your quota resets. See rate limit documentation for more information.