Upgrade Morpho strategies for MORPHO rewards and deploy new OUSD v2 strategy

[naddison36]

Changes

• Added claimMerklRewards to Generalized4626Strategy
• Added claimMorphoRewards Hardhat task
• Added new deployment file to upgrade the three OUSD Morpho strategies
• Added fork tests to claim and collect MORPHO rewards from the Gauntlet Prime USDC strategy
• Add deploy of new Morpho OUSD v2 strategy
• Fork test of new Morpho OUSD v2 strategy

Rewards

Strategy	MORPHO Rewards	Current balance
Gauntlet Prime USDC	2.752k (3.13k USD)	4.9m USDC
Gauntlet Prime USDT	2.207k (2.51k USD)	0 USDT
Steakhouse USDC	88.064 (100.32 USD)	85k USDC

Claim and harvest Process

1. Anyone can call claimMerklRewards on the Morpho strategies which will claim MORPHO tokens to the strategy contract.
2. The multi-chain guardian (2/8) Safe calls collectRewardTokens() on the Morpho strategies.

Hardhat task to claim the MORPHO rewards

pnpm hardhat claimMorphoRewards --network mainnet

Code Change Checklist

To be completed before internal review begins:

• The contract code is complete
• Executable deployment file
• Fork tests that test after the deployment file runs
• Unit tests *if needed
• The owner has done a full checklist review of the code + tests

Internal review:

• Two approvals by internal reviewers

[codecov]

Codecov Report

❌ Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 39.07%. Comparing base (b72a152) to head (87533ef).

Files with missing lines	Patch %	Lines
...s/contracts/strategies/Generalized4626Strategy.sol	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2716      +/-   ##
==========================================
- Coverage   41.10%   39.07%   -2.04%     
==========================================
  Files         126      126              
  Lines        5778     5789      +11     
  Branches     1537     1537              
==========================================
- Hits         2375     2262     -113     
- Misses       3401     3525     +124     
  Partials        2        2              

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[sparrowDom]

It feels to me that all these changes should fit into a new contract smth like 4626MerklStrategy.sol. There might be strategies where Generalized4626 would be used (e.g. for Yearn 3 vaults) that won't be using the Merkl rewards distribution.

[naddison36]

That's what I originally did but then realised Generalized4626USDTStrategy would also have to change it's inheritance. Given the addition was small, I decided to just add merkleClaim to Generalized4626Strategy

[sparrowDom]

LGTM, left 1 comment inline regarding if a new strategy contract should be made for this added functionality