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/rollup.config.mjs

@@ -0,0 +1,50 @@
+
+import { nodeResolve } from '@rollup/plugin-node-resolve';
+
+function getConfig(opts) {
+  if (opts == null) { opts = { }; }
+
+  const file = `./dist/ethers${ (opts.suffix || "") }.js`;
+  const exportConditions = [ "import", "default" ];
+  const mainFields = [ "module", "main" ];
+  if (opts.browser) { mainFields.unshift("browser"); }
+
+  return {
+    input: "./lib.esm/index.js",
+    output: {
+      file,
+      banner: "const __$G = (typeof globalThis !== 'undefined' ? globalThis: typeof window !== 'undefined' ? window: typeof global !== 'undefined' ? global: typeof self !== 'undefined' ? self: {});",
+      name: (opts.name || undefined),
+      format: (opts.format || "esm"),
+      sourcemap: true
+    },
+    context: "__$G",
+    treeshake: true,
+    plugins: [ nodeResolve({
+        exportConditions,
+        mainFields,
+        modulesOnly: true,
+        preferBuiltins: false
+    }) ],
+  };
+}
+
+export default [
+  getConfig({ browser: true }),
+  getConfig({ browser: true, suffix: ".umd", format: "umd", name: "ethers" }),
+  {
+    input: "./lib.esm/wordlists/wordlists-extra.js",
+    output: {
+      file: "./dist/wordlists-extra.js",
+      format: "esm",
+      sourcemap: true
+    },
+    treeshake: true,
+    plugins: [ nodeResolve({
+      exportConditions: [ "default", "module", "import" ],
+      mainFields: [ "browser", "module", "main" ],
+      modulesOnly: true,
+      preferBuiltins: false
+    }) ],
+  }
+];