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/proxy/utils/Initializable.sol

@@ -0,0 +1,238 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.3.0) (proxy/utils/Initializable.sol)
+
+pragma solidity ^0.8.20;
+
+/**
+ * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
+ * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
+ * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
+ * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
+ *
+ * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
+ * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
+ * case an upgrade adds a module that needs to be initialized.
+ *
+ * For example:
+ *
+ * [.hljs-theme-light.nopadding]
+ * ```solidity
+ * contract MyToken is ERC20Upgradeable {
+ *     function initialize() initializer public {
+ *         __ERC20_init("MyToken", "MTK");
+ *     }
+ * }
+ *
+ * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
+ *     function initializeV2() reinitializer(2) public {
+ *         __ERC20Permit_init("MyToken");
+ *     }
+ * }
+ * ```
+ *
+ * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
+ * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
+ *
+ * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
+ * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
+ *
+ * [CAUTION]
+ * ====
+ * Avoid leaving a contract uninitialized.
+ *
+ * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
+ * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
+ * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
+ *
+ * [.hljs-theme-light.nopadding]
+ * ```
+ * /// @custom:oz-upgrades-unsafe-allow constructor
+ * constructor() {
+ *     _disableInitializers();
+ * }
+ * ```
+ * ====
+ */
+abstract contract Initializable {
+    /**
+     * @dev Storage of the initializable contract.
+     *
+     * It's implemented on a custom ERC-7201 namespace to reduce the risk of storage collisions
+     * when using with upgradeable contracts.
+     *
+     * @custom:storage-location erc7201:openzeppelin.storage.Initializable
+     */
+    struct InitializableStorage {
+        /**
+         * @dev Indicates that the contract has been initialized.
+         */
+        uint64 _initialized;
+        /**
+         * @dev Indicates that the contract is in the process of being initialized.
+         */
+        bool _initializing;
+    }
+
+    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Initializable")) - 1)) & ~bytes32(uint256(0xff))
+    bytes32 private constant INITIALIZABLE_STORAGE = 0xf0c57e16840df040f15088dc2f81fe391c3923bec73e23a9662efc9c229c6a00;
+
+    /**
+     * @dev The contract is already initialized.
+     */
+    error InvalidInitialization();
+
+    /**
+     * @dev The contract is not initializing.
+     */
+    error NotInitializing();
+
+    /**
+     * @dev Triggered when the contract has been initialized or reinitialized.
+     */
+    event Initialized(uint64 version);
+
+    /**
+     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
+     * `onlyInitializing` functions can be used to initialize parent contracts.
+     *
+     * Similar to `reinitializer(1)`, except that in the context of a constructor an `initializer` may be invoked any
+     * number of times. This behavior in the constructor can be useful during testing and is not expected to be used in
+     * production.
+     *
+     * Emits an {Initialized} event.
+     */
+    modifier initializer() {
+        // solhint-disable-next-line var-name-mixedcase
+        InitializableStorage storage $ = _getInitializableStorage();
+
+        // Cache values to avoid duplicated sloads
+        bool isTopLevelCall = !$._initializing;
+        uint64 initialized = $._initialized;
+
+        // Allowed calls:
+        // - initialSetup: the contract is not in the initializing state and no previous version was
+        //                 initialized
+        // - construction: the contract is initialized at version 1 (no reinitialization) and the
+        //                 current contract is just being deployed
+        bool initialSetup = initialized == 0 && isTopLevelCall;
+        bool construction = initialized == 1 && address(this).code.length == 0;
+
+        if (!initialSetup && !construction) {
+            revert InvalidInitialization();
+        }
+        $._initialized = 1;
+        if (isTopLevelCall) {
+            $._initializing = true;
+        }
+        _;
+        if (isTopLevelCall) {
+            $._initializing = false;
+            emit Initialized(1);
+        }
+    }
+
+    /**
+     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
+     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
+     * used to initialize parent contracts.
+     *
+     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
+     * are added through upgrades and that require initialization.
+     *
+     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
+     * cannot be nested. If one is invoked in the context of another, execution will revert.
+     *
+     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
+     * a contract, executing them in the right order is up to the developer or operator.
+     *
+     * WARNING: Setting the version to 2**64 - 1 will prevent any future reinitialization.
+     *
+     * Emits an {Initialized} event.
+     */
+    modifier reinitializer(uint64 version) {
+        // solhint-disable-next-line var-name-mixedcase
+        InitializableStorage storage $ = _getInitializableStorage();
+
+        if ($._initializing || $._initialized >= version) {
+            revert InvalidInitialization();
+        }
+        $._initialized = version;
+        $._initializing = true;
+        _;
+        $._initializing = false;
+        emit Initialized(version);
+    }
+
+    /**
+     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
+     * {initializer} and {reinitializer} modifiers, directly or indirectly.
+     */
+    modifier onlyInitializing() {
+        _checkInitializing();
+        _;
+    }
+
+    /**
+     * @dev Reverts if the contract is not in an initializing state. See {onlyInitializing}.
+     */
+    function _checkInitializing() internal view virtual {
+        if (!_isInitializing()) {
+            revert NotInitializing();
+        }
+    }
+
+    /**
+     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
+     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
+     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
+     * through proxies.
+     *
+     * Emits an {Initialized} event the first time it is successfully executed.
+     */
+    function _disableInitializers() internal virtual {
+        // solhint-disable-next-line var-name-mixedcase
+        InitializableStorage storage $ = _getInitializableStorage();
+
+        if ($._initializing) {
+            revert InvalidInitialization();
+        }
+        if ($._initialized != type(uint64).max) {
+            $._initialized = type(uint64).max;
+            emit Initialized(type(uint64).max);
+        }
+    }
+
+    /**
+     * @dev Returns the highest version that has been initialized. See {reinitializer}.
+     */
+    function _getInitializedVersion() internal view returns (uint64) {
+        return _getInitializableStorage()._initialized;
+    }
+
+    /**
+     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
+     */
+    function _isInitializing() internal view returns (bool) {
+        return _getInitializableStorage()._initializing;
+    }
+
+    /**
+     * @dev Pointer to storage slot. Allows integrators to override it with a custom storage location.
+     *
+     * NOTE: Consider following the ERC-7201 formula to derive storage locations.
+     */
+    function _initializableStorageSlot() internal pure virtual returns (bytes32) {
+        return INITIALIZABLE_STORAGE;
+    }
+
+    /**
+     * @dev Returns a pointer to the storage namespace.
+     */
+    // solhint-disable-next-line var-name-mixedcase
+    function _getInitializableStorage() private pure returns (InitializableStorage storage $) {
+        bytes32 slot = _initializableStorageSlot();
+        assembly {
+            $.slot := slot
+        }
+    }
+}

dev/env/node_modules/@openzeppelin/contracts/proxy/utils/UUPSUpgradeable.sol

@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.3.0) (proxy/utils/UUPSUpgradeable.sol)
+
+pragma solidity ^0.8.22;
+
+import {IERC1822Proxiable} from "../../interfaces/draft-IERC1822.sol";
+import {ERC1967Utils} from "../ERC1967/ERC1967Utils.sol";
+
+/**
+ * @dev An upgradeability mechanism designed for UUPS proxies. The functions included here can perform an upgrade of an
+ * {ERC1967Proxy}, when this contract is set as the implementation behind such a proxy.
+ *
+ * A security mechanism ensures that an upgrade does not turn off upgradeability accidentally, although this risk is
+ * reinstated if the upgrade retains upgradeability but removes the security mechanism, e.g. by replacing
+ * `UUPSUpgradeable` with a custom implementation of upgrades.
+ *
+ * The {_authorizeUpgrade} function must be overridden to include access restriction to the upgrade mechanism.
+ */
+abstract contract UUPSUpgradeable is IERC1822Proxiable {
+    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
+    address private immutable __self = address(this);
+
+    /**
+     * @dev The version of the upgrade interface of the contract. If this getter is missing, both `upgradeTo(address)`
+     * and `upgradeToAndCall(address,bytes)` are present, and `upgradeTo` must be used if no function should be called,
+     * while `upgradeToAndCall` will invoke the `receive` function if the second argument is the empty byte string.
+     * If the getter returns `"5.0.0"`, only `upgradeToAndCall(address,bytes)` is present, and the second argument must
+     * be the empty byte string if no function should be called, making it impossible to invoke the `receive` function
+     * during an upgrade.
+     */
+    string public constant UPGRADE_INTERFACE_VERSION = "5.0.0";
+
+    /**
+     * @dev The call is from an unauthorized context.
+     */
+    error UUPSUnauthorizedCallContext();
+
+    /**
+     * @dev The storage `slot` is unsupported as a UUID.
+     */
+    error UUPSUnsupportedProxiableUUID(bytes32 slot);
+
+    /**
+     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
+     * a proxy contract with an implementation (as defined in ERC-1967) pointing to self. This should only be the case
+     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
+     * function through ERC-1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
+     * fail.
+     */
+    modifier onlyProxy() {
+        _checkProxy();
+        _;
+    }
+
+    /**
+     * @dev Check that the execution is not being performed through a delegate call. This allows a function to be
+     * callable on the implementing contract but not through proxies.
+     */
+    modifier notDelegated() {
+        _checkNotDelegated();
+        _;
+    }
+
+    /**
+     * @dev Implementation of the ERC-1822 {proxiableUUID} function. This returns the storage slot used by the
+     * implementation. It is used to validate the implementation's compatibility when performing an upgrade.
+     *
+     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
+     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
+     * function revert if invoked through a proxy. This is guaranteed by the `notDelegated` modifier.
+     */
+    function proxiableUUID() external view virtual notDelegated returns (bytes32) {
+        return ERC1967Utils.IMPLEMENTATION_SLOT;
+    }
+
+    /**
+     * @dev Upgrade the implementation of the proxy to `newImplementation`, and subsequently execute the function call
+     * encoded in `data`.
+     *
+     * Calls {_authorizeUpgrade}.
+     *
+     * Emits an {Upgraded} event.
+     *
+     * @custom:oz-upgrades-unsafe-allow-reachable delegatecall
+     */
+    function upgradeToAndCall(address newImplementation, bytes memory data) public payable virtual onlyProxy {
+        _authorizeUpgrade(newImplementation);
+        _upgradeToAndCallUUPS(newImplementation, data);
+    }
+
+    /**
+     * @dev Reverts if the execution is not performed via delegatecall or the execution
+     * context is not of a proxy with an ERC-1967 compliant implementation pointing to self.
+     */
+    function _checkProxy() internal view virtual {
+        if (
+            address(this) == __self || // Must be called through delegatecall
+            ERC1967Utils.getImplementation() != __self // Must be called through an active proxy
+        ) {
+            revert UUPSUnauthorizedCallContext();
+        }
+    }
+
+    /**
+     * @dev Reverts if the execution is performed via delegatecall.
+     * See {notDelegated}.
+     */
+    function _checkNotDelegated() internal view virtual {
+        if (address(this) != __self) {
+            // Must not be called through delegatecall
+            revert UUPSUnauthorizedCallContext();
+        }
+    }
+
+    /**
+     * @dev Function that should revert when `msg.sender` is not authorized to upgrade the contract. Called by
+     * {upgradeToAndCall}.
+     *
+     * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
+     *
+     * ```solidity
+     * function _authorizeUpgrade(address) internal onlyOwner {}
+     * ```
+     */
+    function _authorizeUpgrade(address newImplementation) internal virtual;
+
+    /**
+     * @dev Performs an implementation upgrade with a security check for UUPS proxies, and additional setup call.
+     *
+     * As a security check, {proxiableUUID} is invoked in the new implementation, and the return value
+     * is expected to be the implementation slot in ERC-1967.
+     *
+     * Emits an {IERC1967-Upgraded} event.
+     */
+    function _upgradeToAndCallUUPS(address newImplementation, bytes memory data) private {
+        try IERC1822Proxiable(newImplementation).proxiableUUID() returns (bytes32 slot) {
+            if (slot != ERC1967Utils.IMPLEMENTATION_SLOT) {
+                revert UUPSUnsupportedProxiableUUID(slot);
+            }
+            ERC1967Utils.upgradeToAndCall(newImplementation, data);
+        } catch {
+            // The implementation is not UUPS
+            revert ERC1967Utils.ERC1967InvalidImplementation(newImplementation);
+        }
+    }
+}