**feat(tests): add tests for TextEncoder, TensorFlow.js, and fallback mechanisms**

- Introduced `test-fallback-function.js` and `test-fallback-simple.js` to validate `executeInThread` fallback functionality with both named and anonymous compute-intensive functions.
- Added `test-tensorflow-textencoder.js` for TensorFlow.js and TextEncoder tests in a Node.js environment.
- Created `test-tensorflow-textencoder.html` for browser-based TensorFlow.js and TextEncoder tests.
- Implemented cross-environment test support in `cli-package/src/test-tensorflow-textencoder.ts` for CLI functionality.
- Enhanced `src/utils/embedding.ts`, `textEncoding.ts`, and `brainy-wrapper.js` to include updated global `TextEncoder` and `TextDecoder` utilities for compatibility and worker improvements.
- Standardized and expanded utility methods in `PlatformNode` for broader support, including `isFloat32Array` and `isTypedArray` checks.
- Updated Node.js requirement to `>= 24.4.0` across documentation and configuration files for compatibility improvements.

This update introduces comprehensive testing for fallback mechanisms, TensorFlow.js, and TextEncoder across multiple environments, ensuring robustness and compatibility.

test-fallback-simple.js

@@ -0,0 +1,52 @@
+// Test script to verify that the function string format works with the fallback mechanism
+import { executeInThread } from './dist/unified.js'
+
+// Define a compute-intensive function using a simple anonymous function expression
+const computeIntensiveFunction = `function(data) {
+  console.log('Worker/Fallback: Starting computation...');
+
+  // Simulate a compute-intensive task
+  const start = Date.now();
+  let result = 0;
+  for (let i = 0; i < data.iterations; i++) {
+    result += Math.sqrt(i) * Math.sin(i);
+  }
+
+  const duration = Date.now() - start;
+  console.log('Worker/Fallback: Computation completed in ' + duration + 'ms');
+
+  return {
+    result,
+    duration,
+    iterations: data.iterations
+  };
+}`
+
+// Test with different environments
+async function runTests() {
+  try {
+    console.log('Testing executeInThread with fallback...')
+    
+    // Disable Web Workers to force fallback
+    const originalWorker = globalThis.Worker
+    globalThis.Worker = function() {
+      throw new Error('Worker constructor disabled for testing')
+    }
+    
+    try {
+      // Execute the function in fallback mode
+      const result = await executeInThread(computeIntensiveFunction, {
+        iterations: 1000000
+      })
+      console.log('Fallback result:', result)
+      console.log('Test passed!')
+    } finally {
+      // Restore Web Workers
+      globalThis.Worker = originalWorker
+    }
+  } catch (error) {
+    console.error('Test failed:', error)
+  }
+}
+
+runTests()