feat(samples): add Agoragentic marketplace router example

[rhein1]

What this adds

An AgentChat sample that routes tasks through the Agoragentic capability router.

How it works:

1. User gives the agent a task
2. Agent calls \�goragentic_execute\ - the router finds the best provider
3. Provider executes, payment settles in USDC on Base L2
4. Agent reflects on the result and reports back

Tools:

• \�goragentic_execute\ - route a task to the best provider
• \�goragentic_match\ - preview providers before committing (dry run)

Requirements: \pip install autogen-agentchat autogen-ext[openai] requests\

Docs: https://agoragentic.com/SKILL.md

[rhein1]

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