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/ethers/src.ts/contract/index.ts

@@ -0,0 +1,31 @@
+/**
+ *  A **Contract** object is a meta-class (a class whose definition is
+ *  defined at runtime), which communicates with a deployed smart contract
+ *  on the blockchain and provides a simple JavaScript interface to call
+ *  methods, send transaction, query historic logs and listen for its events.
+ *
+ *  @_section: api/contract:Contracts  [about-contracts]
+ */
+export {
+    BaseContract, Contract
+} from "./contract.js";
+
+export {
+    ContractFactory
+} from "./factory.js";
+
+export {
+    ContractEventPayload, ContractUnknownEventPayload,
+    ContractTransactionReceipt, ContractTransactionResponse,
+    EventLog, UndecodedEventLog
+} from "./wrappers.js";
+
+export type {
+    BaseContractMethod, ConstantContractMethod,
+    PostfixOverrides,
+    ContractEvent, ContractEventArgs, ContractEventName,
+    ContractDeployTransaction,
+    ContractInterface, ContractMethod, ContractMethodArgs, ContractTransaction,
+    DeferredTopicFilter, Overrides,
+    WrappedFallback
+} from "./types.js";