Add integration test confirming creator supply increments by exactly one on each successful buy

[Chucks1093]

Summary

Each successful buy should increment the creator's key supply by exactly one. An integration test should perform three sequential buys and assert the supply after each one to confirm no off-by-one errors exist in the supply tracking logic.

Scope

• Start from a creator with supply 0
• Perform three sequential buy transactions, each for 1 key
• Assert supply is 1, 2, and 3 after each respective buy
• Assert a failed buy (insufficient funds) does not increment the supply

Acceptance Criteria

• Supply increments by 1 after each successful buy
• Supply correct after 1, 2, and 3 sequential buys
• Failed buy leaves supply unchanged
• Supply reads performed with query_supply read-only function

ETA: 12 hours

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Coordinate on Telegram

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