Enhancement: Add Async Context Management for Resource Cleanup

Problem

Agents lack proper async context management, leading to:

• Resource leaks when agents crash
• Inconsistent cleanup behavior
• No standardized way to initialize/cleanup async resources

Solution

Implement __aenter__ and __aexit__ methods for proper async context management.

Benefits

• ✅ Automatic resource cleanup
• ✅ Exception-safe initialization
• ✅ Professional async patterns
• ✅ Prevents memory leaks

Usage

async with SpoonReactAI(name="agent") as agent:
    result = await agent.run("Hello")
# Automatic cleanup happens here

TG : @fastbuild01