chore: remove MultiPythOracleAdapter for Euler launch

Deletes the multi-feed Pyth oracle adapter and its deployer:
- src/concrete/oracle/MultiPythOracleAdapter.sol
- src/concrete/deploy/MultiPythOracleAdapterBeaconSetDeployer.sol
- src/concrete/deploy/MultiOracleUnifiedDeployer.sol
- All test/src/concrete/oracle/MultiPythOracleAdapter.*.t.sol files
- test/src/concrete/deploy/MultiOracleUnifiedDeployer.t.sol

Drops references throughout:
- script/Deploy.sol: removes deploy fns and DEPLOYMENT_SUITE_MULTI_* constants
- src/lib/LibProdDeploy.sol: drops MULTI_PYTH_ORACLE_ADAPTER_BEACON_SET_DEPLOYER + MULTI_ORACLE_UNIFIED_DEPLOYER constants
- test/src/concrete/ProdFork.t.sol: deletes wtCOIN-multi prod-fork test block and WTCOIN_MULTI_* address constants
- subgraph/{subgraph.yaml,schema.graphql,networks.json,src/{deployer.ts,oracle-adapter.ts},tests/{handlers/handle-oracle-adapter.test.ts,event-mocks.test.ts}}: drops MultiPyth and MultiOracleUnified data sources, entities, handlers, mocks.

Subsumes PR #227 (MultiPyth cascade narrow-catch) since the entire surface area it constrained is gone.

Also fixes stale OLD-style soldeer imports in test/src/concrete/protocol/AutoPausePropagation.t.sol that survived the migration rebase.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: Jai

script/Deploy.sol

@@ -26,12 +26,6 @@ import {
     OracleRegistryBeaconSetDeployer,
     OracleRegistryBeaconSetDeployerConfig
 } from "src/concrete/deploy/OracleRegistryBeaconSetDeployer.sol";
-import {MultiPythOracleAdapter} from "src/concrete/oracle/MultiPythOracleAdapter.sol";
-import {
-    MultiPythOracleAdapterBeaconSetDeployer,
-    MultiPythOracleAdapterBeaconSetDeployerConfig
-} from "src/concrete/deploy/MultiPythOracleAdapterBeaconSetDeployer.sol";
-import {MultiOracleUnifiedDeployer} from "src/concrete/deploy/MultiOracleUnifiedDeployer.sol";
 
 /// @dev The deployment suite name for the pyth oracle adapter beacon set.
 bytes32 constant DEPLOYMENT_SUITE_PYTH_ORACLE_ADAPTER_BEACON_SET = keccak256("pyth-oracle-adapter-beacon-set");
@@ -50,13 +44,6 @@ bytes32 constant DEPLOYMENT_SUITE_ORACLE_UNIFIED_DEPLOYER = keccak256("oracle-un
 /// @dev The deployment suite name for the oracle registry beacon set.
 bytes32 constant DEPLOYMENT_SUITE_ORACLE_REGISTRY_BEACON_SET = keccak256("oracle-registry-beacon-set");
 
-/// @dev The deployment suite name for the multi pyth oracle adapter beacon set.
-bytes32 constant DEPLOYMENT_SUITE_MULTI_PYTH_ORACLE_ADAPTER_BEACON_SET =
-    keccak256("multi-pyth-oracle-adapter-beacon-set");
-
-/// @dev The deployment suite name for the multi oracle unified deployer.
-bytes32 constant DEPLOYMENT_SUITE_MULTI_ORACLE_UNIFIED_DEPLOYER = keccak256("multi-oracle-unified-deployer");
-
 contract Deploy is Script {
     /// @notice Deploys the PythOracleAdapterBeaconSetDeployer contract.
     /// Creates a PythOracleAdapter anew for the initial implementation.
@@ -135,32 +122,6 @@ contract Deploy is Script {
         vm.stopBroadcast();
     }
 
-    /// @notice Deploys the MultiPythOracleAdapterBeaconSetDeployer contract.
-    /// Creates a MultiPythOracleAdapter anew for the initial implementation.
-    /// Initial owner is set to the BEACON_INITIAL_OWNER constant in
-    /// LibProdDeploy.
-    function deployMultiPythOracleAdapterBeaconSet(uint256 deploymentKey) internal {
-        vm.startBroadcast(deploymentKey);
-
-        new MultiPythOracleAdapterBeaconSetDeployer(
-            MultiPythOracleAdapterBeaconSetDeployerConfig({
-                initialOwner: LibProdDeploy.BEACON_INITIAL_OWNER,
-                initialMultiPythOracleAdapterImplementation: address(new MultiPythOracleAdapter())
-            })
-        );
-
-        vm.stopBroadcast();
-    }
-
-    /// @notice Deploys the MultiOracleUnifiedDeployer contract.
-    function deployMultiOracleUnifiedDeployer(uint256 deploymentKey) internal {
-        vm.startBroadcast(deploymentKey);
-
-        new MultiOracleUnifiedDeployer();
-
-        vm.stopBroadcast();
-    }
-
     /// @notice Entry point for the deployment script. Dispatches to the
     /// appropriate deployment function based on the DEPLOYMENT_SUITE environment
     /// variable.
@@ -178,10 +139,6 @@ contract Deploy is Script {
             deployOracleUnifiedDeployer(deployerPrivateKey);
         } else if (suite == DEPLOYMENT_SUITE_ORACLE_REGISTRY_BEACON_SET) {
             deployOracleRegistryBeaconSet(deployerPrivateKey);
-        } else if (suite == DEPLOYMENT_SUITE_MULTI_PYTH_ORACLE_ADAPTER_BEACON_SET) {
-            deployMultiPythOracleAdapterBeaconSet(deployerPrivateKey);
-        } else if (suite == DEPLOYMENT_SUITE_MULTI_ORACLE_UNIFIED_DEPLOYER) {
-            deployMultiOracleUnifiedDeployer(deployerPrivateKey);
         } else {
             revert("Unknown deployment suite");
         }

src/abstract/BasePythOracleAdapter.sol

@@ -106,6 +106,11 @@ abstract contract BasePythOracleAdapter is AggregatorV3Interface {
     /// pausing. Immutable.
     uint64 public pauseTimeAfter;
 
+    /// @dev Reserved storage to avoid shifting subclass slot positions when
+    /// new base-class state is introduced in future versions. Decrement
+    /// `__gap.length` by 1 for each `uint256`-equivalent slot added above.
+    uint256[50] private __gap;
+
     /// @dev Emitted when the manual pause state changes.
     event PauseSet(bool isPaused);
     /// @dev Emitted when the admin is changed.