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/providers/plugin-fallback.ts

@@ -0,0 +1,35 @@
+
+import { AbstractProviderPlugin } from "./abstract-provider.js";
+import { defineProperties } from "../utils/index.js";
+
+import type { AbstractProvider, PerformActionRequest } from "./abstract-provider.js";
+
+
+export const PluginIdFallbackProvider = "org.ethers.plugins.provider.QualifiedPlugin";
+
+export class CheckQualifiedPlugin implements AbstractProviderPlugin {
+    declare name: string;
+
+    constructor() {
+        defineProperties<CheckQualifiedPlugin>(this, { name: PluginIdFallbackProvider });
+    }
+
+    connect(provider: AbstractProvider): CheckQualifiedPlugin {
+        return this;
+    }
+
+    // Retruns true if this value should be considered qualified for
+    // inclusion in the quorum.
+    isQualified(action: PerformActionRequest, result: any): boolean {
+        return true;
+    }
+}
+
+export class PossiblyPrunedTransactionPlugin extends CheckQualifiedPlugin {
+    isQualified(action: PerformActionRequest, result: any): boolean {
+        if (action.method === "getTransaction" || action.method === "getTransactionReceipt") {
+            if (result == null) { return false; }
+        }
+        return super.isQualified(action, result);
+    }
+}