[laxjovial]

Summary

• Guard the Blend adapter deposit and withdraw subtraction with an explicit negative-delta check and checked_sub, panicking with ContractError::Overflow.
• Add mock-pool coverage for below-baseline collateral and recipient balances.

Test plan

• cargo test -p meridian-blend-adapter passes under packages/contracts
• Soroban contract CI passes

Closes #1106

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[collinsezedike]

The guarded subtraction and the two new tests are correct. Amend the commit subject, which is 75 characters and fails the required Commit Messages check, for example fix(blend-adapter): guard subtraction against negative deltas. Also unindent the PR body so Closes #1106 is parsed; the current four-space indent turns it into a code block and GitHub does not link the issue. The PR title is truncated at ov…; complete or shorten it.

[collinsezedike]

@laxjovial Thank you for your contribution. If you are interested, there are more open issues to pick up.

[collinsezedike]

@laxjovial Thank you for your contribution. If you found Meridian useful, please star the repository: https://github.com/drydocs/meridian.