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/hardhat/templates/hardhat-3/01-node-test-runner-viem/test/Counter.ts

@@ -0,0 +1,46 @@
+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+
+import { network } from "hardhat";
+
+describe("Counter", async function () {
+  const { viem } = await network.connect();
+  const publicClient = await viem.getPublicClient();
+
+  it("Should emit the Increment event when calling the inc() function", async function () {
+    const counter = await viem.deployContract("Counter");
+
+    await viem.assertions.emitWithArgs(
+      counter.write.inc(),
+      counter,
+      "Increment",
+      [1n],
+    );
+  });
+
+  it("The sum of the Increment events should match the current value", async function () {
+    const counter = await viem.deployContract("Counter");
+    const deploymentBlockNumber = await publicClient.getBlockNumber();
+
+    // run a series of increments
+    for (let i = 1n; i <= 10n; i++) {
+      await counter.write.incBy([i]);
+    }
+
+    const events = await publicClient.getContractEvents({
+      address: counter.address,
+      abi: counter.abi,
+      eventName: "Increment",
+      fromBlock: deploymentBlockNumber,
+      strict: true,
+    });
+
+    // check that the aggregated events match the current value
+    let total = 0n;
+    for (const event of events) {
+      total += event.args.by;
+    }
+
+    assert.equal(total, await counter.read.x());
+  });
+});