Add regression test for slippage protection on sell passing when proceeds equal min_proceeds exactly

[Chucks1093]

Summary

The sell slippage check should revert only when proceeds fall strictly below min_proceeds. When proceeds equal min_proceeds exactly the transaction must succeed. This boundary condition needs an explicit regression test mirroring the buy-side slippage boundary test.

Scope

• Get the sell quote for a given supply and amount
• Call sell with min_proceeds set to exactly the quoted proceeds
• Assert the sell succeeds
• Call sell with min_proceeds set to one stroop above the quoted proceeds
• Assert the sell reverts with SlippageExceeded

Acceptance Criteria

• Sell succeeds when min_proceeds equals actual proceeds exactly
• Sell reverts when min_proceeds is one stroop above actual proceeds
• No state change occurs after the revert

ETA: 12 hours

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Coordinate on Telegram

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[BWM0223]

PR #507 submitted — slippage boundary test. Payment wallets ready: ETH 0xeaCAb48a4bfA0CED0e668c166615927115655594 | SOL C3MD2yfWYebB8FYXpq6ooqzU5GCQB1bDxbDhQf1JfiCW | BTC bc1qtmlgtvg7xgv0zry3ct90elp3y7d3ffdutk4e2f

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@Akanimoh12's PR #509 was approved and merged by @Chucks1093.

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