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/constants/addresses.ts

@@ -0,0 +1,8 @@
+
+/**
+ *  A constant for the zero address.
+ *
+ *  (**i.e.** ``"0x0000000000000000000000000000000000000000"``)
+ */
+export const ZeroAddress: string = "0x0000000000000000000000000000000000000000";
+

dev/env/node_modules/ethers/src.ts/constants/hashes.ts

@@ -0,0 +1,7 @@
+/**
+ *  A constant for the zero hash.
+ *
+ *  (**i.e.** ``"0x0000000000000000000000000000000000000000000000000000000000000000"``)
+ */
+export const ZeroHash: string = "0x0000000000000000000000000000000000000000000000000000000000000000";
+

dev/env/node_modules/ethers/src.ts/constants/index.ts

@@ -0,0 +1,16 @@
+/**
+ *  Some common constants useful for Ethereum.
+ *
+ *  @_section: api/constants: Constants  [about-constants]
+ */
+
+export { ZeroAddress } from "./addresses.js";
+export { ZeroHash } from "./hashes.js";
+export {
+    N,
+    WeiPerEther,
+    MaxUint256,
+    MinInt256,
+    MaxInt256
+} from "./numbers.js";
+export { EtherSymbol, MessagePrefix } from "./strings.js";

dev/env/node_modules/ethers/src.ts/constants/numbers.ts

@@ -0,0 +1,35 @@
+
+/**
+ *  A constant for the order N for the secp256k1 curve.
+ *
+ *  (**i.e.** ``0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141n``)
+ */
+export const N: bigint = BigInt("0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141");
+
+/**
+ *  A constant for the number of wei in a single ether.
+ *
+ *  (**i.e.** ``1000000000000000000n``)
+ */
+export const WeiPerEther: bigint = BigInt("1000000000000000000");
+
+/**
+ *  A constant for the maximum value for a ``uint256``.
+ *
+ *  (**i.e.** ``0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffn``)
+ */
+export const MaxUint256: bigint = BigInt("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
+
+/**
+ *  A constant for the minimum value for an ``int256``.
+ *
+ *  (**i.e.** ``-8000000000000000000000000000000000000000000000000000000000000000n``)
+ */
+export const MinInt256: bigint = BigInt("0x8000000000000000000000000000000000000000000000000000000000000000") * BigInt(-1);
+
+/**
+ *  A constant for the maximum value for an ``int256``.
+ *
+ *  (**i.e.** ``0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffn``)
+ */
+export const MaxInt256: bigint = BigInt("0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");

dev/env/node_modules/ethers/src.ts/constants/strings.ts

@@ -0,0 +1,16 @@
+// NFKC (composed)             // (decomposed)
+
+/**
+ *  A constant for the ether symbol (normalized using NFKC).
+ *
+ *  (**i.e.** ``"\\u039e"``)
+ */
+export const EtherSymbol: string = "\u039e";  // "\uD835\uDF63";
+
+
+/**
+ *  A constant for the [[link-eip-191]] personal message prefix.
+ *
+ *  (**i.e.** ``"\\x19Ethereum Signed Message:\\n"``)
+ */
+export const MessagePrefix: string = "\x19Ethereum Signed Message:\n";