refactor: simplify entry point to v2 architecture

- Replace 2000+ line monolithic index.ts with thin wrapper importing MemoryV2Plugin
- Update package.json description to reflect three-layer architecture
- Add test script for Node.js built-in test runner

package.json

@@ -1,12 +1,13 @@
 {
   "name": "opencode-working-memory",
   "version": "1.1.2",
-  "description": "Advanced four-tier memory architecture for OpenCode with intelligent pressure monitoring and auto-storage governance",
+  "description": "Three-layer memory architecture for OpenCode with workspace memory and hot session state",
   "type": "module",
   "main": "index.ts",
   "scripts": {
     "build": "node -e \"console.log('No build step required: OpenCode loads index.ts directly')\"",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsc --noEmit",
+    "test": "node --test --experimental-strip-types tests/*.test.ts"
   },
   "keywords": [
     "opencode",