test(creator-keys): add regression test verifying buyer address corre…

[godamongstmen897]

Summary

Closes #341. Introduces an independent integration regression test suite within the creator-keys crate to explicitly assert that emitted buy event topic fields properly contain the executing caller's address.

What Changed

• Regression Isolation: Developed creator-keys/tests/buy_event_buyer_address.rs to validate buyer parameter invariants independently from baseline event fee routines.
• Inbound Address Assertions: Configured precise state hooks confirming that the emitted buyer topic exactly reflects the calling identity vector and is strictly non-zero.
• Drift Prevention: Added distinct event log checking loops to prevent silent field mismatches or serialization truncations across future optimization refactors.

Testing & Validation

• Verified targeted verification assertions pass locally using cargo test -p creator-keys --test buy_event_buyer_address.
• Confirmed entire test runtime is completely decoupled from existing snapshot schemas.

Closes #341

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