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/address/address.ts

@@ -0,0 +1,173 @@
+import { keccak256 } from "../crypto/index.js";
+import { getBytes, assertArgument } from "../utils/index.js";
+
+
+const BN_0 = BigInt(0);
+const BN_36 = BigInt(36);
+
+function getChecksumAddress(address: string): string {
+//    if (!isHexString(address, 20)) {
+//        logger.throwArgumentError("invalid address", "address", address);
+//    }
+
+    address = address.toLowerCase();
+
+    const chars = address.substring(2).split("");
+
+    const expanded = new Uint8Array(40);
+    for (let i = 0; i < 40; i++) {
+        expanded[i] = chars[i].charCodeAt(0);
+    }
+
+    const hashed = getBytes(keccak256(expanded));
+
+    for (let i = 0; i < 40; i += 2) {
+        if ((hashed[i >> 1] >> 4) >= 8) {
+            chars[i] = chars[i].toUpperCase();
+        }
+        if ((hashed[i >> 1] & 0x0f) >= 8) {
+            chars[i + 1] = chars[i + 1].toUpperCase();
+        }
+    }
+
+    return "0x" + chars.join("");
+}
+
+// See: https://en.wikipedia.org/wiki/International_Bank_Account_Number
+
+// Create lookup table
+const ibanLookup: { [character: string]: string } = { };
+for (let i = 0; i < 10; i++) { ibanLookup[String(i)] = String(i); }
+for (let i = 0; i < 26; i++) { ibanLookup[String.fromCharCode(65 + i)] = String(10 + i); }
+
+// How many decimal digits can we process? (for 64-bit float, this is 15)
+// i.e. Math.floor(Math.log10(Number.MAX_SAFE_INTEGER));
+const safeDigits = 15;
+
+function ibanChecksum(address: string): string {
+    address = address.toUpperCase();
+    address = address.substring(4) + address.substring(0, 2) + "00";
+
+    let expanded = address.split("").map((c) => { return ibanLookup[c]; }).join("");
+
+    // Javascript can handle integers safely up to 15 (decimal) digits
+    while (expanded.length >= safeDigits){
+        let block = expanded.substring(0, safeDigits);
+        expanded = parseInt(block, 10) % 97 + expanded.substring(block.length);
+    }
+
+    let checksum = String(98 - (parseInt(expanded, 10) % 97));
+    while (checksum.length < 2) { checksum = "0" + checksum; }
+
+    return checksum;
+};
+
+const Base36 = (function() {;
+    const result: Record<string, bigint> = { };
+    for (let i = 0; i < 36; i++) {
+        const key = "0123456789abcdefghijklmnopqrstuvwxyz"[i];
+        result[key] = BigInt(i);
+    }
+    return result;
+})();
+
+function fromBase36(value: string): bigint {
+    value = value.toLowerCase();
+
+    let result = BN_0;
+    for (let i = 0; i < value.length; i++) {
+        result = result * BN_36 + Base36[value[i]];
+    }
+    return result;
+}
+
+/**
+ *  Returns a normalized and checksumed address for %%address%%.
+ *  This accepts non-checksum addresses, checksum addresses and
+ *  [[getIcapAddress]] formats.
+ *
+ *  The checksum in Ethereum uses the capitalization (upper-case
+ *  vs lower-case) of the characters within an address to encode
+ *  its checksum, which offers, on average, a checksum of 15-bits.
+ *
+ *  If %%address%% contains both upper-case and lower-case, it is
+ *  assumed to already be a checksum address and its checksum is
+ *  validated, and if the address fails its expected checksum an
+ *  error is thrown.
+ *
+ *  If you wish the checksum of %%address%% to be ignore, it should
+ *  be converted to lower-case (i.e. ``.toLowercase()``) before
+ *  being passed in. This should be a very rare situation though,
+ *  that you wish to bypass the safegaurds in place to protect
+ *  against an address that has been incorrectly copied from another
+ *  source.
+ *
+ *  @example:
+ *    // Adds the checksum (via upper-casing specific letters)
+ *    getAddress("0x8ba1f109551bd432803012645ac136ddd64dba72")
+ *    //_result:
+ *
+ *    // Converts ICAP address and adds checksum
+ *    getAddress("XE65GB6LDNXYOFTX0NSV3FUWKOWIXAMJK36");
+ *    //_result:
+ *
+ *    // Throws an error if an address contains mixed case,
+ *    // but the checksum fails
+ *    getAddress("0x8Ba1f109551bD432803012645Ac136ddd64DBA72")
+ *    //_error:
+ */
+export function getAddress(address: string): string {
+
+    assertArgument(typeof(address) === "string", "invalid address", "address", address);
+
+    if (address.match(/^(0x)?[0-9a-fA-F]{40}$/)) {
+
+        // Missing the 0x prefix
+        if (!address.startsWith("0x")) { address = "0x" + address; }
+
+        const result = getChecksumAddress(address);
+
+        // It is a checksummed address with a bad checksum
+        assertArgument(!address.match(/([A-F].*[a-f])|([a-f].*[A-F])/) || result === address,
+            "bad address checksum", "address", address);
+
+        return result;
+    }
+
+    // Maybe ICAP? (we only support direct mode)
+    if (address.match(/^XE[0-9]{2}[0-9A-Za-z]{30,31}$/)) {
+        // It is an ICAP address with a bad checksum
+        assertArgument(address.substring(2, 4) === ibanChecksum(address), "bad icap checksum", "address", address);
+
+        let result = fromBase36(address.substring(4)).toString(16);
+        while (result.length < 40) { result = "0" + result; }
+        return  getChecksumAddress("0x" + result);
+    }
+
+    assertArgument(false, "invalid address", "address", address);
+}
+
+/**
+ *  The [ICAP Address format](link-icap) format is an early checksum
+ *  format which attempts to be compatible with the banking
+ *  industry [IBAN format](link-wiki-iban) for bank accounts.
+ *
+ *  It is no longer common or a recommended format.
+ *
+ *  @example:
+ *    getIcapAddress("0x8ba1f109551bd432803012645ac136ddd64dba72");
+ *    //_result:
+ *
+ *    getIcapAddress("XE65GB6LDNXYOFTX0NSV3FUWKOWIXAMJK36");
+ *    //_result:
+ *
+ *    // Throws an error if the ICAP checksum is wrong
+ *    getIcapAddress("XE65GB6LDNXYOFTX0NSV3FUWKOWIXAMJK37");
+ *    //_error:
+ */
+export function getIcapAddress(address: string): string {
+    //let base36 = _base16To36(getAddress(address).substring(2)).toUpperCase();
+    let base36 = BigInt(getAddress(address)).toString(36).toUpperCase();
+    while (base36.length < 30) { base36 = "0" + base36; }
+    return "XE" + ibanChecksum("XE00" + base36) + base36;
+}