refactor: remove src/cortex/ directory and fix README claims

- Move neuralImport.ts and neuralImportAugmentation.ts to src/neural/
- Delete 3 dead files (healthCheck, backupRestore, performanceMonitor)
- Remove cortex entries from package.json browser field
- Fix unsubstantiated performance claims in README (add PROJECTED labels)
- Delete stale dist/cortex/ artifacts

package.json

@@ -60,12 +60,7 @@
   "browser": {
     "./dist/distributed": false,
     "./dist/cli": false,
-    "./dist/scripts": false,
-    "./dist/cortex": false,
-    "./dist/cortex/neuralImport.js": false,
-    "./dist/cortex/performanceMonitor.js": false,
-    "./dist/cortex/healthCheck.js": false,
-    "./dist/cortex/backupRestore.js": false
+    "./dist/scripts": false
   },
   "engines": {
     "node": "22.x",