refactor: move brother_node development artifact to dev/test-nodes subdirectory

Development Artifact Cleanup:
✅ BROTHER_NODE REORGANIZATION: Moved development test node to appropriate location
- dev/test-nodes/brother_node/: Moved from root directory for better organization
- Contains development configuration, test logs, and test chain data
- No impact on production systems - purely development/testing artifact

✅ DEVELOPMENT ARTIFACTS IDENTIFIED:
- Chain ID: aitbc-brother-chain (test/development chain)
- Ports: 8010 (P2P) and 8011 (RPC) - different from production
- Environment: .env file with test configuration
- Logs: rpc.log and node.log from development testing session (March 15, 2026)

✅ ROOT DIRECTORY CLEANUP: Removed development clutter from production directory
- brother_node/ moved to dev/test-nodes/brother_node/
- Root directory now contains only production-ready components
- Development artifacts properly organized in dev/ subdirectory

DIRECTORY STRUCTURE IMPROVEMENT:
📁 dev/test-nodes/: Development and testing node configurations
🏗️ Root Directory: Clean production structure with only essential components
🧪 Development Isolation: Test environments separated from production

BENEFITS:
✅ Clean Production Directory: No development artifacts in root
✅ Better Organization: Development nodes grouped in dev/ subdirectory
✅ Clear Separation: Production vs development environments clearly distinguished
✅ Maintainability: Easier to identify and manage development components

RESULT: Successfully moved brother_node development artifact to dev/test-nodes/ subdirectory, cleaning up the root directory while preserving development testing environment for future use.

dev/env/node_modules/@openzeppelin/contracts/account/utils/EIP7702Utils.sol

@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (account/utils/EIP7702Utils.sol)
+
+pragma solidity ^0.8.20;
+
+/**
+ * @dev Library with common EIP-7702 utility functions.
+ *
+ * See https://eips.ethereum.org/EIPS/eip-7702[ERC-7702].
+ */
+library EIP7702Utils {
+    bytes3 internal constant EIP7702_PREFIX = 0xef0100;
+
+    /**
+     * @dev Returns the address of the delegate if `account` as an EIP-7702 delegation setup, or address(0) otherwise.
+     */
+    function fetchDelegate(address account) internal view returns (address) {
+        bytes23 delegation = bytes23(account.code);
+        return bytes3(delegation) == EIP7702_PREFIX ? address(bytes20(delegation << 24)) : address(0);
+    }
+}

dev/env/node_modules/@openzeppelin/contracts/account/utils/draft-ERC4337Utils.sol

@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.3.0) (account/utils/draft-ERC4337Utils.sol)
+
+pragma solidity ^0.8.20;
+
+import {IEntryPoint, PackedUserOperation} from "../../interfaces/draft-IERC4337.sol";
+import {Math} from "../../utils/math/Math.sol";
+import {Calldata} from "../../utils/Calldata.sol";
+import {Packing} from "../../utils/Packing.sol";
+
+/// @dev This is available on all entrypoint since v0.4.0, but is not formally part of the ERC.
+interface IEntryPointExtra {
+    function getUserOpHash(PackedUserOperation calldata userOp) external view returns (bytes32);
+}
+
+/**
+ * @dev Library with common ERC-4337 utility functions.
+ *
+ * See https://eips.ethereum.org/EIPS/eip-4337[ERC-4337].
+ */
+library ERC4337Utils {
+    using Packing for *;
+
+    /// @dev Address of the entrypoint v0.7.0
+    IEntryPoint internal constant ENTRYPOINT_V07 = IEntryPoint(0x0000000071727De22E5E9d8BAf0edAc6f37da032);
+
+    /// @dev Address of the entrypoint v0.8.0
+    IEntryPoint internal constant ENTRYPOINT_V08 = IEntryPoint(0x4337084D9E255Ff0702461CF8895CE9E3b5Ff108);
+
+    /// @dev For simulation purposes, validateUserOp (and validatePaymasterUserOp) return this value on success.
+    uint256 internal constant SIG_VALIDATION_SUCCESS = 0;
+
+    /// @dev For simulation purposes, validateUserOp (and validatePaymasterUserOp) must return this value in case of signature failure, instead of revert.
+    uint256 internal constant SIG_VALIDATION_FAILED = 1;
+
+    /// @dev Parses the validation data into its components. See {packValidationData}.
+    function parseValidationData(
+        uint256 validationData
+    ) internal pure returns (address aggregator, uint48 validAfter, uint48 validUntil) {
+        validAfter = uint48(bytes32(validationData).extract_32_6(0));
+        validUntil = uint48(bytes32(validationData).extract_32_6(6));
+        aggregator = address(bytes32(validationData).extract_32_20(12));
+        if (validUntil == 0) validUntil = type(uint48).max;
+    }
+
+    /// @dev Packs the validation data into a single uint256. See {parseValidationData}.
+    function packValidationData(
+        address aggregator,
+        uint48 validAfter,
+        uint48 validUntil
+    ) internal pure returns (uint256) {
+        return uint256(bytes6(validAfter).pack_6_6(bytes6(validUntil)).pack_12_20(bytes20(aggregator)));
+    }
+
+    /// @dev Same as {packValidationData}, but with a boolean signature success flag.
+    function packValidationData(bool sigSuccess, uint48 validAfter, uint48 validUntil) internal pure returns (uint256) {
+        return
+            packValidationData(
+                address(uint160(Math.ternary(sigSuccess, SIG_VALIDATION_SUCCESS, SIG_VALIDATION_FAILED))),
+                validAfter,
+                validUntil
+            );
+    }
+
+    /**
+     * @dev Combines two validation data into a single one.
+     *
+     * The `aggregator` is set to {SIG_VALIDATION_SUCCESS} if both are successful, while
+     * the `validAfter` is the maximum and the `validUntil` is the minimum of both.
+     */
+    function combineValidationData(uint256 validationData1, uint256 validationData2) internal pure returns (uint256) {
+        (address aggregator1, uint48 validAfter1, uint48 validUntil1) = parseValidationData(validationData1);
+        (address aggregator2, uint48 validAfter2, uint48 validUntil2) = parseValidationData(validationData2);
+
+        bool success = aggregator1 == address(uint160(SIG_VALIDATION_SUCCESS)) &&
+            aggregator2 == address(uint160(SIG_VALIDATION_SUCCESS));
+        uint48 validAfter = uint48(Math.max(validAfter1, validAfter2));
+        uint48 validUntil = uint48(Math.min(validUntil1, validUntil2));
+        return packValidationData(success, validAfter, validUntil);
+    }
+
+    /// @dev Returns the aggregator of the `validationData` and whether it is out of time range.
+    function getValidationData(uint256 validationData) internal view returns (address aggregator, bool outOfTimeRange) {
+        (address aggregator_, uint48 validAfter, uint48 validUntil) = parseValidationData(validationData);
+        return (aggregator_, block.timestamp < validAfter || validUntil < block.timestamp);
+    }
+
+    /// @dev Get the hash of a user operation for a given entrypoint
+    function hash(PackedUserOperation calldata self, address entrypoint) internal view returns (bytes32) {
+        // NOTE: getUserOpHash is available since v0.4.0
+        //
+        // Prior to v0.8.0, this was easy to replicate for any entrypoint and chainId. Since v0.8.0 of the
+        // entrypoint, this depends on the Entrypoint's domain separator, which cannot be hardcoded and is complex
+        // to recompute. Domain separator could be fetch using the `getDomainSeparatorV4` getter, or recomputed from
+        // the ERC-5267 getter, but both operation would require doing a view call to the entrypoint. Overall it feels
+        // simpler and less error prone to get that functionality from the entrypoint directly.
+        return IEntryPointExtra(entrypoint).getUserOpHash(self);
+    }
+
+    /// @dev Returns `factory` from the {PackedUserOperation}, or address(0) if the initCode is empty or not properly formatted.
+    function factory(PackedUserOperation calldata self) internal pure returns (address) {
+        return self.initCode.length < 20 ? address(0) : address(bytes20(self.initCode[0:20]));
+    }
+
+    /// @dev Returns `factoryData` from the {PackedUserOperation}, or empty bytes if the initCode is empty or not properly formatted.
+    function factoryData(PackedUserOperation calldata self) internal pure returns (bytes calldata) {
+        return self.initCode.length < 20 ? Calldata.emptyBytes() : self.initCode[20:];
+    }
+
+    /// @dev Returns `verificationGasLimit` from the {PackedUserOperation}.
+    function verificationGasLimit(PackedUserOperation calldata self) internal pure returns (uint256) {
+        return uint128(self.accountGasLimits.extract_32_16(0));
+    }
+
+    /// @dev Returns `callGasLimit` from the {PackedUserOperation}.
+    function callGasLimit(PackedUserOperation calldata self) internal pure returns (uint256) {
+        return uint128(self.accountGasLimits.extract_32_16(16));
+    }
+
+    /// @dev Returns the first section of `gasFees` from the {PackedUserOperation}.
+    function maxPriorityFeePerGas(PackedUserOperation calldata self) internal pure returns (uint256) {
+        return uint128(self.gasFees.extract_32_16(0));
+    }
+
+    /// @dev Returns the second section of `gasFees` from the {PackedUserOperation}.
+    function maxFeePerGas(PackedUserOperation calldata self) internal pure returns (uint256) {
+        return uint128(self.gasFees.extract_32_16(16));
+    }
+
+    /// @dev Returns the total gas price for the {PackedUserOperation} (ie. `maxFeePerGas` or `maxPriorityFeePerGas + basefee`).
+    function gasPrice(PackedUserOperation calldata self) internal view returns (uint256) {
+        unchecked {
+            // Following values are "per gas"
+            uint256 maxPriorityFee = maxPriorityFeePerGas(self);
+            uint256 maxFee = maxFeePerGas(self);
+            return Math.min(maxFee, maxPriorityFee + block.basefee);
+        }
+    }
+
+    /// @dev Returns the first section of `paymasterAndData` from the {PackedUserOperation}.
+    function paymaster(PackedUserOperation calldata self) internal pure returns (address) {
+        return self.paymasterAndData.length < 52 ? address(0) : address(bytes20(self.paymasterAndData[0:20]));
+    }
+
+    /// @dev Returns the second section of `paymasterAndData` from the {PackedUserOperation}.
+    function paymasterVerificationGasLimit(PackedUserOperation calldata self) internal pure returns (uint256) {
+        return self.paymasterAndData.length < 52 ? 0 : uint128(bytes16(self.paymasterAndData[20:36]));
+    }
+
+    /// @dev Returns the third section of `paymasterAndData` from the {PackedUserOperation}.
+    function paymasterPostOpGasLimit(PackedUserOperation calldata self) internal pure returns (uint256) {
+        return self.paymasterAndData.length < 52 ? 0 : uint128(bytes16(self.paymasterAndData[36:52]));
+    }
+
+    /// @dev Returns the fourth section of `paymasterAndData` from the {PackedUserOperation}.
+    function paymasterData(PackedUserOperation calldata self) internal pure returns (bytes calldata) {
+        return self.paymasterAndData.length < 52 ? Calldata.emptyBytes() : self.paymasterAndData[52:];
+    }
+}

dev/env/node_modules/@openzeppelin/contracts/account/utils/draft-ERC7579Utils.sol

@@ -0,0 +1,280 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.4.0) (account/utils/draft-ERC7579Utils.sol)
+
+pragma solidity ^0.8.20;
+
+import {Execution} from "../../interfaces/draft-IERC7579.sol";
+import {Packing} from "../../utils/Packing.sol";
+import {Address} from "../../utils/Address.sol";
+
+type Mode is bytes32;
+type CallType is bytes1;
+type ExecType is bytes1;
+type ModeSelector is bytes4;
+type ModePayload is bytes22;
+
+/**
+ * @dev Library with common ERC-7579 utility functions.
+ *
+ * See https://eips.ethereum.org/EIPS/eip-7579[ERC-7579].
+ */
+// slither-disable-next-line unused-state
+library ERC7579Utils {
+    using Packing for *;
+
+    /// @dev A single `call` execution.
+    CallType internal constant CALLTYPE_SINGLE = CallType.wrap(0x00);
+
+    /// @dev A batch of `call` executions.
+    CallType internal constant CALLTYPE_BATCH = CallType.wrap(0x01);
+
+    /// @dev A `delegatecall` execution.
+    CallType internal constant CALLTYPE_DELEGATECALL = CallType.wrap(0xFF);
+
+    /// @dev Default execution type that reverts on failure.
+    ExecType internal constant EXECTYPE_DEFAULT = ExecType.wrap(0x00);
+
+    /// @dev Execution type that does not revert on failure.
+    ExecType internal constant EXECTYPE_TRY = ExecType.wrap(0x01);
+
+    /**
+     * @dev Emits when an {EXECTYPE_TRY} execution fails.
+     * @param batchExecutionIndex The index of the failed call in the execution batch.
+     * @param returndata The returned data from the failed call.
+     */
+    event ERC7579TryExecuteFail(uint256 batchExecutionIndex, bytes returndata);
+
+    /// @dev The provided {CallType} is not supported.
+    error ERC7579UnsupportedCallType(CallType callType);
+
+    /// @dev The provided {ExecType} is not supported.
+    error ERC7579UnsupportedExecType(ExecType execType);
+
+    /// @dev The provided module doesn't match the provided module type.
+    error ERC7579MismatchedModuleTypeId(uint256 moduleTypeId, address module);
+
+    /// @dev The module is not installed.
+    error ERC7579UninstalledModule(uint256 moduleTypeId, address module);
+
+    /// @dev The module is already installed.
+    error ERC7579AlreadyInstalledModule(uint256 moduleTypeId, address module);
+
+    /// @dev The module type is not supported.
+    error ERC7579UnsupportedModuleType(uint256 moduleTypeId);
+
+    /// @dev Input calldata not properly formatted and possibly malicious.
+    error ERC7579DecodingError();
+
+    /// @dev Executes a single call.
+    function execSingle(
+        bytes calldata executionCalldata,
+        ExecType execType
+    ) internal returns (bytes[] memory returnData) {
+        (address target, uint256 value, bytes calldata callData) = decodeSingle(executionCalldata);
+        returnData = new bytes[](1);
+        returnData[0] = _call(0, execType, target, value, callData);
+    }
+
+    /// @dev Executes a batch of calls.
+    function execBatch(
+        bytes calldata executionCalldata,
+        ExecType execType
+    ) internal returns (bytes[] memory returnData) {
+        Execution[] calldata executionBatch = decodeBatch(executionCalldata);
+        returnData = new bytes[](executionBatch.length);
+        for (uint256 i = 0; i < executionBatch.length; ++i) {
+            returnData[i] = _call(
+                i,
+                execType,
+                executionBatch[i].target,
+                executionBatch[i].value,
+                executionBatch[i].callData
+            );
+        }
+    }
+
+    /// @dev Executes a delegate call.
+    function execDelegateCall(
+        bytes calldata executionCalldata,
+        ExecType execType
+    ) internal returns (bytes[] memory returnData) {
+        (address target, bytes calldata callData) = decodeDelegate(executionCalldata);
+        returnData = new bytes[](1);
+        returnData[0] = _delegatecall(0, execType, target, callData);
+    }
+
+    /// @dev Encodes the mode with the provided parameters. See {decodeMode}.
+    function encodeMode(
+        CallType callType,
+        ExecType execType,
+        ModeSelector selector,
+        ModePayload payload
+    ) internal pure returns (Mode mode) {
+        return
+            Mode.wrap(
+                CallType
+                    .unwrap(callType)
+                    .pack_1_1(ExecType.unwrap(execType))
+                    .pack_2_4(bytes4(0))
+                    .pack_6_4(ModeSelector.unwrap(selector))
+                    .pack_10_22(ModePayload.unwrap(payload))
+            );
+    }
+
+    /// @dev Decodes the mode into its parameters. See {encodeMode}.
+    function decodeMode(
+        Mode mode
+    ) internal pure returns (CallType callType, ExecType execType, ModeSelector selector, ModePayload payload) {
+        return (
+            CallType.wrap(Packing.extract_32_1(Mode.unwrap(mode), 0)),
+            ExecType.wrap(Packing.extract_32_1(Mode.unwrap(mode), 1)),
+            ModeSelector.wrap(Packing.extract_32_4(Mode.unwrap(mode), 6)),
+            ModePayload.wrap(Packing.extract_32_22(Mode.unwrap(mode), 10))
+        );
+    }
+
+    /// @dev Encodes a single call execution. See {decodeSingle}.
+    function encodeSingle(
+        address target,
+        uint256 value,
+        bytes calldata callData
+    ) internal pure returns (bytes memory executionCalldata) {
+        return abi.encodePacked(target, value, callData);
+    }
+
+    /// @dev Decodes a single call execution. See {encodeSingle}.
+    function decodeSingle(
+        bytes calldata executionCalldata
+    ) internal pure returns (address target, uint256 value, bytes calldata callData) {
+        target = address(bytes20(executionCalldata[0:20]));
+        value = uint256(bytes32(executionCalldata[20:52]));
+        callData = executionCalldata[52:];
+    }
+
+    /// @dev Encodes a delegate call execution. See {decodeDelegate}.
+    function encodeDelegate(
+        address target,
+        bytes calldata callData
+    ) internal pure returns (bytes memory executionCalldata) {
+        return abi.encodePacked(target, callData);
+    }
+
+    /// @dev Decodes a delegate call execution. See {encodeDelegate}.
+    function decodeDelegate(
+        bytes calldata executionCalldata
+    ) internal pure returns (address target, bytes calldata callData) {
+        target = address(bytes20(executionCalldata[0:20]));
+        callData = executionCalldata[20:];
+    }
+
+    /// @dev Encodes a batch of executions. See {decodeBatch}.
+    function encodeBatch(Execution[] memory executionBatch) internal pure returns (bytes memory executionCalldata) {
+        return abi.encode(executionBatch);
+    }
+
+    /// @dev Decodes a batch of executions. See {encodeBatch}.
+    ///
+    /// NOTE: This function runs some checks and will throw a {ERC7579DecodingError} if the input is not properly formatted.
+    function decodeBatch(bytes calldata executionCalldata) internal pure returns (Execution[] calldata executionBatch) {
+        unchecked {
+            uint256 bufferLength = executionCalldata.length;
+
+            // Check executionCalldata is not empty.
+            if (bufferLength < 32) revert ERC7579DecodingError();
+
+            // Get the offset of the array (pointer to the array length).
+            uint256 arrayLengthOffset = uint256(bytes32(executionCalldata[0:32]));
+
+            // The array length (at arrayLengthOffset) should be 32 bytes long. We check that this is within the
+            // buffer bounds. Since we know bufferLength is at least 32, we can subtract with no overflow risk.
+            if (arrayLengthOffset > bufferLength - 32) revert ERC7579DecodingError();
+
+            // Get the array length. arrayLengthOffset + 32 is bounded by bufferLength so it does not overflow.
+            uint256 arrayLength = uint256(bytes32(executionCalldata[arrayLengthOffset:arrayLengthOffset + 32]));
+
+            // Check that the buffer is long enough to store the array elements as "offset pointer":
+            // - each element of the array is an "offset pointer" to the data.
+            // - each "offset pointer" (to an array element) takes 32 bytes.
+            // - validity of the calldata at that location is checked when the array element is accessed, so we only
+            //   need to check that the buffer is large enough to hold the pointers.
+            //
+            // Since we know bufferLength is at least arrayLengthOffset + 32, we can subtract with no overflow risk.
+            // Solidity limits length of such arrays to 2**64-1, this guarantees `arrayLength * 32` does not overflow.
+            if (arrayLength > type(uint64).max || bufferLength - arrayLengthOffset - 32 < arrayLength * 32)
+                revert ERC7579DecodingError();
+
+            assembly ("memory-safe") {
+                executionBatch.offset := add(add(executionCalldata.offset, arrayLengthOffset), 0x20)
+                executionBatch.length := arrayLength
+            }
+        }
+    }
+
+    /// @dev Executes a `call` to the target with the provided {ExecType}.
+    function _call(
+        uint256 index,
+        ExecType execType,
+        address target,
+        uint256 value,
+        bytes calldata data
+    ) private returns (bytes memory) {
+        (bool success, bytes memory returndata) = (target == address(0) ? address(this) : target).call{value: value}(
+            data
+        );
+        return _validateExecutionMode(index, execType, success, returndata);
+    }
+
+    /// @dev Executes a `delegatecall` to the target with the provided {ExecType}.
+    function _delegatecall(
+        uint256 index,
+        ExecType execType,
+        address target,
+        bytes calldata data
+    ) private returns (bytes memory) {
+        (bool success, bytes memory returndata) = (target == address(0) ? address(this) : target).delegatecall(data);
+        return _validateExecutionMode(index, execType, success, returndata);
+    }
+
+    /// @dev Validates the execution mode and returns the returndata.
+    function _validateExecutionMode(
+        uint256 index,
+        ExecType execType,
+        bool success,
+        bytes memory returndata
+    ) private returns (bytes memory) {
+        if (execType == ERC7579Utils.EXECTYPE_DEFAULT) {
+            Address.verifyCallResult(success, returndata);
+        } else if (execType == ERC7579Utils.EXECTYPE_TRY) {
+            if (!success) emit ERC7579TryExecuteFail(index, returndata);
+        } else {
+            revert ERC7579UnsupportedExecType(execType);
+        }
+        return returndata;
+    }
+}
+
+// Operators
+using {eqCallType as ==} for CallType global;
+using {eqExecType as ==} for ExecType global;
+using {eqModeSelector as ==} for ModeSelector global;
+using {eqModePayload as ==} for ModePayload global;
+
+/// @dev Compares two `CallType` values for equality.
+function eqCallType(CallType a, CallType b) pure returns (bool) {
+    return CallType.unwrap(a) == CallType.unwrap(b);
+}
+
+/// @dev Compares two `ExecType` values for equality.
+function eqExecType(ExecType a, ExecType b) pure returns (bool) {
+    return ExecType.unwrap(a) == ExecType.unwrap(b);
+}
+
+/// @dev Compares two `ModeSelector` values for equality.
+function eqModeSelector(ModeSelector a, ModeSelector b) pure returns (bool) {
+    return ModeSelector.unwrap(a) == ModeSelector.unwrap(b);
+}
+
+/// @dev Compares two `ModePayload` values for equality.
+function eqModePayload(ModePayload a, ModePayload b) pure returns (bool) {
+    return ModePayload.unwrap(a) == ModePayload.unwrap(b);
+}