**docs: remove outdated statistics-related documentation and add standards**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  - Deleted outdated statistics documentation files (`statistics.md`, `statistics-flush-solution.md`, `statistics-summary.md`) to clean up the repository and avoid confusion.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/unified.ts

@@ -17,7 +17,14 @@
 import './setup.js'
 
 // Import environment detection functions
-import { isBrowser, isNode } from './utils/environment.js'
+import { 
+  isBrowser, 
+  isNode, 
+  isWebWorker, 
+  isThreadingAvailable, 
+  isThreadingAvailableAsync, 
+  areWorkerThreadsAvailable 
+} from './utils/environment.js'
 
 // Export environment information with lazy evaluation
 export const environment = {
@@ -29,6 +36,18 @@ export const environment = {
   },
   get isServerless() {
     return !isBrowser() && !isNode()
+  },
+  isWebWorker: function() {
+    return isWebWorker()
+  },
+  get isThreadingAvailable() {
+    return isThreadingAvailable()
+  },
+  isThreadingAvailableAsync: function() {
+    return isThreadingAvailableAsync()
+  },
+  areWorkerThreadsAvailable: function() {
+    return areWorkerThreadsAvailable()
   }
 }