fix: improve tool interoperability and remove dependencies

[cagataycali]

Tool Interoperability Improvements and Dependency Removal

This PR enhances multiple tool components to better work together by improving interoperability and removing unnecessary dependencies.

Key Changes

• think.py: Now inherits parent agent's traces and tools to maintain context
• load_tool.py: Removed unnecessary hot_reload_tools dependency check
• use_llm.py: Now properly passes trace_attributes from parent agent
• mem0_memory.py: Code formatting and readability improvements
• tests: Updated to match new implementation patterns

Architecture Changes

Before

flowchart TD
    A[Parent Agent] -->|Create| B[think tool]
    B -->|Call| C[use_llm]
    C -->|Create new| D[Agent]
    D -->|No access to parent tools| E[Limited functionality]
    
    F[load_tool] -->|Check| G[hot_reload_tools flag]
    G -->|Must be true| H[Load tool]

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After

flowchart TD
    A[Parent Agent] -->|Create with context| B[think tool]
    B -->|Inherits| C[Parent tools]
    B -->|Inherits| D[trace_attributes]
    B -->|Create directly| E[New Agent]
    E -->|Has parent context| F[Enhanced functionality]
    
    G[load_tool] -->|Only checks| H[STRANDS_DISABLE_LOAD_TOOL]
    H -->|If not true| I[Load tool]

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Technical Benefits

graph LR
    subgraph "Improved Interoperability"
        A[Trace Attribute Passing]
        B[Tool Inheritance]
        C[Context Preservation]
    end
    
    subgraph "Dependency Reduction"
        D[Removed hot_reload_tools]
        E[Simplified Loading Logic]
    end
    
    subgraph "Code Quality"
        F[Better Formatting]
        G[Condensed Logic]
        H[Improved Testing]
    end
    
    A --> X[Enhanced User Experience]
    B --> X
    C --> X
    D --> Y[Reduced Complexity]
    E --> Y
    F --> Z[Better Maintainability]
    G --> Z
    H --> Z

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