**docs: remove outdated statistics-related documentation and add standards**

- **Removed Files**:
  - Deleted outdated statistics documentation files (`statistics.md`, `statistics-flush-solution.md`, `statistics-summary.md`) to clean up the repository and avoid confusion.

- **Added Standards**:
  - Introduced `DOCUMENTATION_STANDARDS.md` to outline naming conventions and troubleshooting practices for more consistent and maintainable project documentation.

- **Tests**:
  - Added a new test file `edge-cases.test.ts` to verify handling of edge cases, ensuring robust behavior against boundary values and invalid inputs.

**Purpose**: Cleans up deprecated documentation while introducing concrete standards for maintaining and updating documentation. Enhances test coverage for unusual or boundary inputs, improving overall system resilience.

src/types/global.d.ts

@@ -0,0 +1,54 @@
+/**
+ * Global type declarations for Brainy
+ */
+
+import { TensorFlowUtilObject } from './tensorflowTypes'
+
+declare global {
+  // These declarations are needed for the project
+  // eslint-disable-next-line no-var
+  var __vitest__: any
+  // eslint-disable-next-line no-var
+  var __TextEncoder__: typeof TextEncoder
+  // eslint-disable-next-line no-var
+  var __TextDecoder__: typeof TextDecoder
+  // eslint-disable-next-line no-var
+  var __brainy_util__: any
+  // eslint-disable-next-line no-var
+  var _utilShim: any
+  // eslint-disable-next-line no-var
+  var __utilShim: any
+  
+  namespace NodeJS {
+    interface Global {
+      util?: TensorFlowUtilObject
+      TextDecoder?: typeof TextDecoder
+      TextEncoder?: typeof TextEncoder
+    }
+  }
+  
+  // Add compatibility for TextDecoder in utils
+  interface TextDecoderOptions {
+    fatal?: boolean
+    ignoreBOM?: boolean
+  }
+  
+  interface TextDecodeOptions {
+    stream?: boolean
+  }
+  
+  interface TextDecoder {
+    readonly encoding: string
+    readonly fatal: boolean
+    readonly ignoreBOM: boolean
+    decode(input?: ArrayBuffer | ArrayBufferView | null, options?: TextDecodeOptions): string
+  }
+  
+  interface TextEncoder {
+    readonly encoding: string
+    encode(input?: string): Uint8Array
+    encodeInto(input: string, output: Uint8Array): { read: number, written: number }
+  }
+}
+
+export {}

src/types/tensorflowTypes.ts

@@ -35,15 +35,4 @@ declare global {
   interface WorkerGlobalScope {
     importTensorFlow?: () => Promise<any>
   }
-
-  // Declare types for the global object and globalThis
-  var global: {
-    util?: TensorFlowUtilObject
-    [key: string]: any
-  }
-
-  var globalThis: {
-    util?: TensorFlowUtilObject
-    [key: string]: any
-  }
 }