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/utils/utf8.ts

@@ -0,0 +1,325 @@
+/**
+ *  Using strings in Ethereum (or any security-basd system) requires
+ *  additional care. These utilities attempt to mitigate some of the
+ *  safety issues as well as provide the ability to recover and analyse
+ *  strings.
+ *
+ *  @_subsection api/utils:Strings and UTF-8  [about-strings]
+ */
+import { getBytes } from "./data.js";
+import { assertArgument, assertNormalize } from "./errors.js";
+
+import type { BytesLike } from "./index.js";
+
+
+///////////////////////////////
+
+/**
+ *  The stanard normalization forms.
+ */
+export type UnicodeNormalizationForm = "NFC" | "NFD" | "NFKC" | "NFKD";
+
+/**
+ *  When using the UTF-8 error API the following errors can be intercepted
+ *  and processed as the %%reason%% passed to the [[Utf8ErrorFunc]].
+ *
+ *  **``"UNEXPECTED_CONTINUE"``** - a continuation byte was present where there
+ *  was nothing to continue.
+ *
+ *  **``"BAD_PREFIX"``** - an invalid (non-continuation) byte to start a
+ *  UTF-8 codepoint was found.
+ *
+ *  **``"OVERRUN"``** - the string is too short to process the expected
+ *  codepoint length.
+ *
+ *  **``"MISSING_CONTINUE"``** - a missing continuation byte was expected but
+ *  not found. The %%offset%% indicates the index the continuation byte
+ *  was expected at.
+ *
+ *  **``"OUT_OF_RANGE"``** - the computed code point is outside the range
+ *  for UTF-8. The %%badCodepoint%% indicates the computed codepoint, which was
+ *  outside the valid UTF-8 range.
+ *
+ *  **``"UTF16_SURROGATE"``** - the UTF-8 strings contained a UTF-16 surrogate
+ *  pair. The %%badCodepoint%% is the computed codepoint, which was inside the
+ *  UTF-16 surrogate range.
+ *
+ *  **``"OVERLONG"``** - the string is an overlong representation. The
+ *  %%badCodepoint%% indicates the computed codepoint, which has already
+ *  been bounds checked.
+ *
+ *
+ *  @returns string
+ */
+export type Utf8ErrorReason = "UNEXPECTED_CONTINUE" | "BAD_PREFIX" | "OVERRUN" |
+    "MISSING_CONTINUE" | "OUT_OF_RANGE" | "UTF16_SURROGATE" | "OVERLONG";
+
+
+/**
+ *  A callback that can be used with [[toUtf8String]] to analysis or
+ *  recovery from invalid UTF-8 data.
+ *
+ *  Parsing UTF-8 data is done through a simple Finite-State Machine (FSM)
+ *  which calls the ``Utf8ErrorFunc`` if a fault is detected.
+ *
+ *  The %%reason%% indicates where in the FSM execution the fault
+ *  occurred and the %%offset%% indicates where the input failed.
+ *
+ *  The %%bytes%% represents the raw UTF-8 data that was provided and
+ *  %%output%% is the current array of UTF-8 code-points, which may
+ *  be updated by the ``Utf8ErrorFunc``.
+ *
+ *  The value of the %%badCodepoint%% depends on the %%reason%%. See
+ *  [[Utf8ErrorReason]] for details.
+ *
+ *  The function should return the number of bytes that should be skipped
+ *  when control resumes to the FSM.
+ */
+export type Utf8ErrorFunc = (reason: Utf8ErrorReason, offset: number, bytes: Uint8Array, output: Array<number>, badCodepoint?: number) => number;
+
+
+function errorFunc(reason: Utf8ErrorReason, offset: number, bytes: Uint8Array, output: Array<number>, badCodepoint?: number): number {
+    assertArgument(false, `invalid codepoint at offset ${ offset }; ${ reason }`, "bytes", bytes);
+}
+
+function ignoreFunc(reason: Utf8ErrorReason, offset: number, bytes: Uint8Array, output: Array<number>, badCodepoint?: number): number {
+
+    // If there is an invalid prefix (including stray continuation), skip any additional continuation bytes
+    if (reason === "BAD_PREFIX" || reason === "UNEXPECTED_CONTINUE") {
+        let i = 0;
+        for (let o = offset + 1; o < bytes.length; o++) {
+            if (bytes[o] >> 6 !== 0x02) { break; }
+            i++;
+        }
+        return i;
+    }
+
+    // This byte runs us past the end of the string, so just jump to the end
+    // (but the first byte was read already read and therefore skipped)
+    if (reason === "OVERRUN") {
+        return bytes.length - offset - 1;
+    }
+
+    // Nothing to skip
+    return 0;
+}
+
+function replaceFunc(reason: Utf8ErrorReason, offset: number, bytes: Uint8Array, output: Array<number>, badCodepoint?: number): number {
+
+    // Overlong representations are otherwise "valid" code points; just non-deistingtished
+    if (reason === "OVERLONG") {
+        assertArgument(typeof(badCodepoint) === "number", "invalid bad code point for replacement", "badCodepoint", badCodepoint);
+        output.push(badCodepoint);
+        return 0;
+    }
+
+    // Put the replacement character into the output
+    output.push(0xfffd);
+
+    // Otherwise, process as if ignoring errors
+    return ignoreFunc(reason, offset, bytes, output, badCodepoint);
+}
+
+/**
+ *  A handful of popular, built-in UTF-8 error handling strategies.
+ *
+ *  **``"error"``** - throws on ANY illegal UTF-8 sequence or
+ *  non-canonical (overlong) codepoints (this is the default)
+ *
+ *  **``"ignore"``** - silently drops any illegal UTF-8 sequence
+ *  and accepts non-canonical (overlong) codepoints
+ *
+ *  **``"replace"``** - replace any illegal UTF-8 sequence with the
+ *  UTF-8 replacement character (i.e. ``"\\ufffd"``) and accepts
+ *  non-canonical (overlong) codepoints
+ *
+ *  @returns: Record<"error" | "ignore" | "replace", Utf8ErrorFunc>
+ */
+export const Utf8ErrorFuncs: Readonly<Record<"error" | "ignore" | "replace", Utf8ErrorFunc>> = Object.freeze({
+    error: errorFunc,
+    ignore: ignoreFunc,
+    replace: replaceFunc
+});
+
+// http://stackoverflow.com/questions/13356493/decode-utf-8-with-javascript#13691499
+function getUtf8CodePoints(_bytes: BytesLike, onError?: Utf8ErrorFunc): Array<number> {
+    if (onError == null) { onError = Utf8ErrorFuncs.error; }
+
+    const bytes = getBytes(_bytes, "bytes");
+
+    const result: Array<number> = [];
+    let i = 0;
+
+    // Invalid bytes are ignored
+    while(i < bytes.length) {
+
+        const c = bytes[i++];
+
+        // 0xxx xxxx
+        if (c >> 7 === 0) {
+            result.push(c);
+            continue;
+        }
+
+        // Multibyte; how many bytes left for this character?
+        let extraLength: null | number = null;
+        let overlongMask: null | number = null;
+
+        // 110x xxxx 10xx xxxx
+        if ((c & 0xe0) === 0xc0) {
+            extraLength = 1;
+            overlongMask = 0x7f;
+
+        // 1110 xxxx 10xx xxxx 10xx xxxx
+        } else if ((c & 0xf0) === 0xe0) {
+            extraLength = 2;
+            overlongMask = 0x7ff;
+
+        // 1111 0xxx 10xx xxxx 10xx xxxx 10xx xxxx
+        } else if ((c & 0xf8) === 0xf0) {
+            extraLength = 3;
+            overlongMask = 0xffff;
+
+        } else {
+            if ((c & 0xc0) === 0x80) {
+                i += onError("UNEXPECTED_CONTINUE", i - 1, bytes, result);
+            } else {
+                i += onError("BAD_PREFIX", i - 1, bytes, result);
+            }
+            continue;
+        }
+
+        // Do we have enough bytes in our data?
+        if (i - 1 + extraLength >= bytes.length) {
+            i += onError("OVERRUN", i - 1, bytes, result);
+            continue;
+        }
+
+        // Remove the length prefix from the char
+        let res: null | number = c & ((1 << (8 - extraLength - 1)) - 1);
+
+        for (let j = 0; j < extraLength; j++) {
+            let nextChar = bytes[i];
+
+            // Invalid continuation byte
+            if ((nextChar & 0xc0) != 0x80) {
+                i += onError("MISSING_CONTINUE", i, bytes, result);
+                res = null;
+                break;
+            };
+
+            res = (res << 6) | (nextChar & 0x3f);
+            i++;
+        }
+
+        // See above loop for invalid continuation byte
+        if (res === null) { continue; }
+
+        // Maximum code point
+        if (res > 0x10ffff) {
+            i += onError("OUT_OF_RANGE", i - 1 - extraLength, bytes, result, res);
+            continue;
+        }
+
+        // Reserved for UTF-16 surrogate halves
+        if (res >= 0xd800 && res <= 0xdfff) {
+            i += onError("UTF16_SURROGATE", i - 1 - extraLength, bytes, result, res);
+            continue;
+        }
+
+        // Check for overlong sequences (more bytes than needed)
+        if (res <= overlongMask) {
+            i += onError("OVERLONG", i - 1 - extraLength, bytes, result, res);
+            continue;
+        }
+
+        result.push(res);
+    }
+
+    return result;
+}
+
+// http://stackoverflow.com/questions/18729405/how-to-convert-utf8-string-to-byte-array
+
+/**
+ *  Returns the UTF-8 byte representation of %%str%%.
+ *
+ *  If %%form%% is specified, the string is normalized.
+ */
+export function toUtf8Bytes(str: string, form?: UnicodeNormalizationForm): Uint8Array {
+    assertArgument(typeof(str) === "string", "invalid string value", "str", str);
+
+    if (form != null) {
+        assertNormalize(form);
+        str = str.normalize(form);
+    }
+
+    let result: Array<number> = [];
+    for (let i = 0; i < str.length; i++) {
+        const c = str.charCodeAt(i);
+
+        if (c < 0x80) {
+            result.push(c);
+
+        } else if (c < 0x800) {
+            result.push((c >> 6) | 0xc0);
+            result.push((c & 0x3f) | 0x80);
+
+        } else if ((c & 0xfc00) == 0xd800) {
+            i++;
+            const c2 = str.charCodeAt(i);
+
+            assertArgument(i < str.length && ((c2 & 0xfc00) === 0xdc00),
+                "invalid surrogate pair", "str", str);
+
+            // Surrogate Pair
+            const pair = 0x10000 + ((c & 0x03ff) << 10) + (c2 & 0x03ff);
+            result.push((pair >> 18) | 0xf0);
+            result.push(((pair >> 12) & 0x3f) | 0x80);
+            result.push(((pair >> 6) & 0x3f) | 0x80);
+            result.push((pair & 0x3f) | 0x80);
+
+        } else {
+            result.push((c >> 12) | 0xe0);
+            result.push(((c >> 6) & 0x3f) | 0x80);
+            result.push((c & 0x3f) | 0x80);
+        }
+    }
+
+    return new Uint8Array(result);
+};
+
+//export 
+function _toUtf8String(codePoints: Array<number>): string {
+    return codePoints.map((codePoint) => {
+        if (codePoint <= 0xffff) {
+            return String.fromCharCode(codePoint);
+        }
+        codePoint -= 0x10000;
+        return String.fromCharCode(
+            (((codePoint >> 10) & 0x3ff) + 0xd800),
+            ((codePoint & 0x3ff) + 0xdc00)
+        );
+    }).join("");
+}
+
+/**
+ *  Returns the string represented by the UTF-8 data %%bytes%%.
+ *
+ *  When %%onError%% function is specified, it is called on UTF-8
+ *  errors allowing recovery using the [[Utf8ErrorFunc]] API.
+ *  (default: [error](Utf8ErrorFuncs))
+ */
+export function toUtf8String(bytes: BytesLike, onError?: Utf8ErrorFunc): string {
+    return _toUtf8String(getUtf8CodePoints(bytes, onError));
+}
+
+/**
+ *  Returns the UTF-8 code-points for %%str%%.
+ *
+ *  If %%form%% is specified, the string is normalized.
+ */
+export function toUtf8CodePoints(str: string, form?: UnicodeNormalizationForm): Array<number> {
+    return getUtf8CodePoints(toUtf8Bytes(str, form));
+}
+