chore: sync submodule state (parent ref update)

Made-with: Cursor

docs/vault/IMPLEMENTATION_SUMMARY.md

@@ -320,6 +320,14 @@ contracts/vault/
 
 See `docs/vault/COMPLIANCE_REQUIREMENTS.md` for complete compliance documentation.
 
+### GRU Smart Vault and PMM Integration
+
+- **PMM price for vault valuation**: When collateral or debt is a token that has a PMM pool (e.g. cUSDT, cUSDC), price can be obtained from **PMMPriceProvider** (`contracts/vault/adapters/PMMPriceProvider.sol`). It wraps DODOPMMIntegration and exposes `getPrice(asset, quoteToken)` using `getPoolPriceOrOracle` (oracle-backed when ReserveSystem is set on DODOPMMIntegration). The Ledger’s primary valuation remains XAU via XAUOracle; PMMPriceProvider is for optional use by keepers, UIs, or a future Ledger extension that supports a secondary price source per asset.
+- **Vault as LP / PMM liquidity**: A vault (or its regulated entity) can add liquidity to PMM pools by calling **DODOPMMIntegration.addLiquidity(pool, baseAmount, quoteAmount)**. The vault (or entity) must hold base and quote tokens and approve the integration contract. Required role on DODOPMMIntegration: none for addLiquidity (anyone can add); pool creation requires **POOL_MANAGER_ROLE**. LP positions are not currently accepted as collateral in the Ledger; that would require a future extension (e.g. LP token as approved asset and a valuation path for LP shares).
+- **GRUHandler / registry**: GRU assets used in vaults should be validated via **GRUHandler** (`contracts/registry/handlers/GRUHandler.sol`). Register any new PMM-related or GRU asset types in **ChainRegistry** / **UniversalAssetRegistry** as applicable.
+
+See also: `docs/integration/DODO_PMM_INTEGRATION.md`, `docs/integration/ORACLE_AND_KEEPER_CHAIN138.md`.
+
 ## Notes
 
 - The system is designed for regulated, institutional, and sovereign-grade deployment