feat: add CrewAI APort task decorator

[HamidA1998]

Summary

Closes #30 by adding a CrewAI-focused APort verification decorator under examples/agent-frameworks/crewai.

The integration includes:

• @aport_verify decorator for sync and async task functions
• A small dependency-free APortHTTPClient fallback
• Support for static, callable, kwarg, or environment-derived agent IDs
• Context builders for passing task-specific facts into APort verification
• Clear APortVerificationError handling before task execution
• A runnable example and README usage docs
• Unit tests covering successful verification, deny responses, derived agent IDs, env agent IDs, strict/non-strict behavior, and async tasks

Validation

• PYTHONPATH=src python3 -m unittest discover -s tests
• python3 -m compileall src tests examples
• PYTHONPATH=src python3 examples/basic_usage.py
• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Strip verification-only kwargs before invoking task

The decorator advertises runtime agent IDs via aport_agent_id/agent_id, but both wrappers forward kwargs unchanged into the task call. For tasks that do not declare these parameters (a common case), calling task(..., aport_agent_id="...") triggers TypeError after verification, so the documented runtime override path is effectively broken unless every task accepts those extra kwargs (or **kwargs). Remove/decorate these internal kwargs before calling the wrapped function.

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[lout33]

I would like to work on this. Building the CrewAI task decorator integration now.