feat: Policies component

[boazdavid]

Summary by CodeRabbit

Release Notes

• New Features

  • Added policy-based tool protection system with business policy enforcement
  • Introduced Policies component for generating guard code from policy definitions
  • Support for multiple language models including GPT-4o and Claude
  • Enhanced tool metadata to expose output schemas

• Dependencies

  • Added toolguard>=0.2.4

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