feat: add bounded parallel runner for the normal test suite

deno.json

@@ -1,4 +1,8 @@
 {
+  "tasks": {
+    "test": "deno run --allow-read --allow-write=target --allow-run --allow-env tools/test.ts",
+    "test:runner": "deno test --allow-read --allow-write --allow-run --allow-env tools/test.test.ts"
+  },
   "fmt": {
     "proseWrap": "never"
   }