feat: add AI2Human action provider for human-execution task dispatch

[richard7463]

Summary

Adds the AI2Human action provider — lets CDP agents dispatch reality-bound tasks to human operators with proof verification and USDC settlement. When your agent hits a step it can't complete alone (local verification, physical checks, identity actions, compliance reviews, errands), AI2Human dispatches it to a human.

Actions

Action	Description
ai2human_create_task	Dispatch a human-execution task
ai2human_check_task	Check task status, proof verification, and settlement
ai2human_get_proof	Retrieve evidence bundle and settlement receipt
ai2human_list_categories	List supported task categories and proof types

Details

• Network support: network-agnostic (supports_network returns True)
• Dependencies: uses requests (already in AgentKit deps), no new dependencies
• Auth: reads AI2HUMAN_API_KEY from environment (with AI2HUMAN_AGENT_KEY fallback, AI2HUMAN_BASE_URL optional)
• Error handling: all actions return JSON error strings on failure

Usage

from coinbase_agentkit import AgentKit, AgentKitConfig, ai2human_action_provider

agent_kit = AgentKit(AgentKitConfig(
    action_providers=[ai2human_action_provider()],
))

Related

• PyPI: https://pypi.org/project/ai2human-agentkit/
• Docs: https://ai2human.io/developers
• Also listed on the AgentKit Wishlist: "Integrate with commerce rails for agent payments"

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[cb-heimdall]

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