chore: initialize monorepo scaffold with npm workspaces

packages/core/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "@visionl/core",
+  "version": "0.1.0",
+  "private": true,
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "scripts": {
+    "typecheck": "tsc -b",
+    "build": "tsc -b"
+  }
+}

packages/core/src/index.ts

@@ -0,0 +1,2 @@
+// @visionl/core — placeholder, to be implemented in Task 2
+export const VERSION = '0.1.0';

packages/core/tsconfig.json

@@ -0,0 +1,8 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src"
+  },
+  "include": ["src"]
+}