[FEATURE] Identity/reputation verification tool for agent payments

Feature Area

Integration with external tools

Is your feature request related to an existing bug?

NA

Describe the solution you'd like

A CrewAI tool (_verify) that checks the counterparty's identity/reputation before a CrewAI agent sends a payment — complementary to payment-execution tools like the Spraay batch/escrow tools proposed in #6609 (closed, unmerged), not overlapping with them. It calls a verification endpoint that reads the payment proof the agent already produced for its own rail (x402, etc. — no extra signature) and returns a structured verdict (APPROVED/DENIED) plus reputation for both sides, raising a clear error when the underlying package isn't installed (same lazy-import pattern already used elsewhere in this repo).

We already have a working implementation in our SDK: https://github.com/Ensi81/Avel (agent_interchange/tools.py, _verify method), used the same way _pay/_get_balance are exposed there.

Describe alternatives you've considered

NA

Additional context

Opening this per the contributing guide's requirement (an open issue before a first-time-contributor PR) — following up from feedback on #6609, where CodeRabbit itself suggested this as a useful follow-up.

Willingness to Contribute

Yes, I'd be happy to submit a pull request

Start by reviewing the existing CrewAI external-tool integrations and the lazy-import pattern referenced in the issue. Use Avel's agent_interchange/tools.py and its _verify, _pay, and _get_balance entry points as the implementation reference. Done means the verification tool returns the structured APPROVED or DENIED verdict with both reputations and raises a clear error when the underlying package is unavailable.