test(rfc): use portable Node WASI runner

Author: JairusSW

rfc.config.json

@@ -15,7 +15,7 @@
   },
   "runOptions": {
     "runtime": {
-      "cmd": "wago <file>"
+      "cmd": "node ./scripts/run-as-test-wasi.mjs <file>"
     }
   },
   "modes": {

scripts/run-as-test-wasi.mjs

@@ -0,0 +1,8 @@
+import { instantiate } from "as-test/lib";
+
+const wasmPath = process.argv[2];
+if (!wasmPath) throw new Error("Expected a WebAssembly test file path");
+
+process.env.AS_TEST_WASM_PATH = wasmPath;
+const instance = await instantiate({});
+instance.exports.start?.();