Add regression test for buy quote consistency before and after a sell

[Chucks1093]

Summary
Performing a sell changes the total supply, which in turn affects the buy quote. A regression test that records the buy quote at a given supply, performs a sell, and re-checks the buy quote at the new supply confirms the quote reflects the updated supply correctly.

Scope

• add a regression test that reads the buy quote before a sell
• perform a sell that reduces the supply
• assert the buy quote after the sell reflects the reduced supply

Acceptance Criteria

• the buy quote after a sell differs from the pre-sell quote by the expected amount
• the test fails if the quote does not update after the supply change
• the test uses the bonding curve price helper to compute expected values

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[Dannyswiss1]

@Dannyswiss1 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

can I work on this?

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[drips-wave]

Congratulations, @Dannyswiss1! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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