Feature: Color-coded agent names for parallel subagent execution

Summary

When running multiple agents in parallel (via the Agent tool or Agent Teams), it is difficult to distinguish which agent's output is which in the terminal.

Proposal

Add color-coded agent names/labels in the terminal output so that each parallel agent is visually distinguishable. For example:

• Agent A → displayed in blue
• Agent B → displayed in green
• Agent C → displayed in orange

This would significantly improve readability when multiple agents are running concurrently.

Current behavior

All agent outputs look the same in the terminal — same color, same style. Users must read the agent description text to identify which agent produced which output.

Expected behavior

Each agent running in parallel gets assigned a unique color (from a configurable palette), making it easy to scan and identify agent outputs at a glance.

Use case

When working on complex tasks that spawn 3+ parallel agents (e.g., one for research, one for implementation, one for testing), quickly identifying which agent is reporting what is essential for efficient workflow.

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