Add Credit Market AMO Strategy

[shahthepro]

Code Changes

• Adds CreditMarketAMOStrategy, an AMO that mints an OToken and supplies it as the sole lender into a deposit-gated Morpho Vault V2 ("credit vault"). Borrowers post their own collateral and borrow the
  OToken; the interest they pay grows the strategy's position and reaches OToken holders as rebase yield. The strategy only ever mints OToken in and burns OToken out — it never touches the Vault's backing
  asset.

• The contract is generic: the OToken, hard asset, and credit vault are set at deploy time, so one implementation serves OUSD or OETH. Wired up for OUSD first.

Key design decisions

• Phantom backing. checkBalance reports the full live position value (keeps total value and rebase correct), but the strategy provides zero redemption capacity — it can only burn OToken. mintCap is the
  only on-chain bound and must be sized below the protocol's real redeemable liquidity.
• mintCap-gated minting. Minting is off until governance raises the cap; mintAndSupply / redeemAndBurn are Governor-or-Strategist; withdrawAll tolerates illiquidity so cleanup never reverts.
• Yield-first accounting. netMinted tracks principal still deployed, drawing accrued interest down before principal, so netMinted ≤ positionValue() always.
• Shared merkle claim. Extracted merkleClaim into AbstractMerkleClaimStrategy, now shared with Generalized4626Strategy.

[codecov]

Codecov Report

❌ Patch coverage is 85.00000% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.37%. Comparing base (5acff6a) to head (f5d87df).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...ntracts/strategies/AbstractMerkleClaimStrategy.sol	8.33%	11 Missing ⚠️
...s/contracts/strategies/CreditMarketAMOStrategy.sol	98.52%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2927      +/-   ##
==========================================
+ Coverage   44.63%   45.37%   +0.74%     
==========================================
  Files         110      112       +2     
  Lines        4920     4989      +69     
  Branches     1362     1381      +19     
==========================================
+ Hits         2196     2264      +68     
- Misses       2721     2722       +1     
  Partials        3        3              

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[naddison36]

A simple and clean implementation. Well done.

I think we need to decide if principal and accruedYield should be the true values or we just document that these aren't accurate as the netMinted amount will be less than the true principal amount once a burn has been done.

[naddison36]

nit: is this view function adding value over the already public netMinted storage variable?

Also, netMinted may drift below the true principal once accrued interest is burned (redeemAndBurn lowers it by the amount withdrawn, floored at 0).

[shahthepro]

I removed principal and another duplicate method. Re: the drift, I changed how the strategy behaves: it now burns through the yield/interest tokens first before it eats into the printed tokens.

So, if there's 100 OUSD minted and an interest of 10 OUSD is earned on top of it, when the strategist burns 50 OUSD, netMinted will be 60 OUSD (instead of 50 OUSD with the original implementation): f5d87df

[naddison36]

this won't be the true accrued yield after yielded oTokens are burned leaving netMinted not reflecting the true principal amount.

[shahthepro]

Fixed by changing the behaviour to burn through yield first: f5d87df