[IMPROVEMENT] Implement full streaming support in autonomous loop structure (max_loops='auto')

[kyegomez]

Summary

Fix and complete streaming support in the autonomous loop structure (max_loops="auto"). Currently, streaming works partially during planning and execution phases but does not work in the final summary phase, breaking the end-to-end streaming experience.

The autonomous loop structure in agent.py supports three phases:

1. Planning Phase ✅ - Streaming works
2. Execution Phase ✅ - Streaming works
3. Summary Phase ❌ - Streaming does NOT work

When users enable streaming (streaming_on=True or stream=True) with max_loops="auto", they expect continuous token streaming throughout the entire autonomous loop. However, the final summary generation happens without streaming, causing an inconsistent user experience.

Current Behavior

from swarms import Agent

# User enables streaming with autonomous loop
agent = Agent(
    agent_name="TaskAgent",
    system_prompt="You are a helpful assistant",
    model_name="gpt-4",
    max_loops="auto",  # Autonomous loop enabled
    streaming_on=True,  # User expects streaming throughout
    verbose=True
)

def on_token(token):
    print(token, end="", flush=True)

# Run with streaming callback
result = agent.run(
    task="Create a comprehensive marketing plan",
    streaming_callback=on_token
)

# Result:
# ✅ Planning phase streams tokens
# ✅ Execution phase streams tokens
# ❌ Summary phase does NOT stream (silent until complete)

This improvement is essential for production-grade autonomous agents where real-time feedback and responsiveness are critical requirements.