Add integration test for the contract correctly handling a buy and immediate sell in the same ledger without state corruption

[Chucks1093]

Summary

A buy and sell in the same ledger must each see the correct supply: the sell must observe the supply after the buy, not the pre-buy value. An integration test should submit both operations in the same ledger and verify the final supply and holder count are consistent.

Scope

• Submit a buy of 5 keys and a sell of 5 keys in the same ledger
• Assert the final supply equals the supply before the buy (net zero change)
• Assert the holder count returns to the pre-buy value if the wallet sold all its keys
• Assert no intermediate state is observable between the two operations
• Assert the buy event new_supply and sell event new_supply are consistent with the sequence

Acceptance Criteria

• Final supply equals pre-buy supply after net-zero buy+sell
• Holder count returns to pre-buy value
• Buy and sell events have consistent new_supply values
• No state corruption from same-ledger operations

ETA: 12 hours

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Coordinate on Telegram

[Francis6-git]

My approach:
I’ll add an integration test that submits a 5-key buy and immediate 5-key sell in the same ledger, then verify the final supply and holder count return to their pre-buy values.

I’ll also validate the buy/sell event "new_supply" values follow the correct sequence and confirm no inconsistent intermediate state is persisted.