Add AI Access Control Example

[gemanor]

This PR contains an example of utilizing tools and structured prompts for adding access control to AI agents

The code uses Permit.io's fine-grained authorization service to model and enforce the policies.

[hyperlint-ai]

PR Change Summary

Added an example demonstrating AI access control using Permit.io and PydanticAI.

• Introduced an AI Access Control example for financial advisors
• Implemented structured prompts for permission checks
• Provided setup instructions for Permit.io API and local microservice
• Included demo and further reading resources on AI access control

Added Files

• docs/examples/ai-access-control.md

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