feat: add surplus check on batch liquidations

[GalloDaSballo]

Summary by CodeRabbit

• New Features
  • Enhanced surplus checks in smart contracts for improved financial integrity and stability.

[coderabbitai[bot]]

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Commits

Files that changed from the base of the PR and between c5f39c374d5ebf1d63ecb2dbfb00edc418088d85 and 95d1a0b69d23dc0635ba787dc356e1eeec70a86e.

Walkthrough

The recent update to the TargetFunctions.sol contract introduces a refined approach to managing surplus in both the collateral pool and user accounts. Notably, it establishes tiered surplus checks at three distinct levels and incorporates a new verification mechanism for surpluses generated from liquidated Collateralized Debt Positions (CDPs), enhancing the contract's financial robustness and operational efficiency.

Changes

File Path	Summary
.../TestContracts/invariants/TargetFunctions.sol	Updated surplus checks at 12, 8, and 4 wei levels for collateral pool and user surplus. Added check for surplus from liquidated CDPs.

🐇✨
In the realm of code, where smart contracts thrive,
A rabbit hopped through, making surplus alive.
At levels twain, twelve, eight, and four,
Each CDP's fate, now secure evermore.
With every hop, a surplus checked,
In blockchain's burrow, finances decked.
🌟🥕

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[getrecon-bot]

Job ID	27d60107-7341-4156-8cf7-0f9794096ad6
Command	yarn && git submodule init && git submodule update && solc-select use 0.8.17 && cd packages/contracts/ && yarn echidna --test-mode assertion --test-limit 300000
Instance ID	i-09a12a17d88265a65
Instance Type	c5.2xlarge
Status	Started
Elapsed

[getrecon-bot]

Job ID	27d60107-7341-4156-8cf7-0f9794096ad6
Command	yarn && git submodule init && git submodule update && solc-select use 0.8.17 && cd packages/contracts/ && yarn echidna --test-mode assertion --test-limit 300000
Instance ID	i-09a12a17d88265a65
Instance Type	c5.2xlarge
Status	Running
Elapsed	44 seconds

[getrecon-bot]

Job ID	27d60107-7341-4156-8cf7-0f9794096ad6
Command	yarn && git submodule init && git submodule update && solc-select use 0.8.17 && cd packages/contracts/ && yarn echidna --test-mode assertion --test-limit 300000
Instance ID	i-09a12a17d88265a65
Instance Type	c5.2xlarge
Status	Running
Elapsed	45 seconds

[getrecon-bot]

Job ID	27d60107-7341-4156-8cf7-0f9794096ad6
Command	yarn && git submodule init && git submodule update && solc-select use 0.8.17 && cd packages/contracts/ && yarn echidna --test-mode assertion --test-limit 300000
Instance ID	i-09a12a17d88265a65
Instance Type	c5.2xlarge
Status	Error
Elapsed	1 day 7 hours 48 minutes 56 seconds