Add root test script using Turborepo

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -14,6 +14,7 @@
     "lint:fix": "biome check --write --unsafe && turbo run lint -- --fix",
     "typecheck": "turbo typecheck",
     "clean": "turbo clean",
+    "test": "turbo test",
     "db:codegen": "bun run --cwd packages/db-schema generate"
   },
   "devDependencies": {

turbo.json

@@ -29,6 +29,11 @@
       "dependsOn": ["^build"],
       "inputs": ["src/**/*.ts", "src/**/*.test.ts"],
       "cache": false
+    },
+    "test": {
+      "dependsOn": ["^build"],
+      "inputs": ["src/**/*.ts", "src/**/*.test.ts"],
+      "cache": false
     }
   }
 }