test(05-01): scaffold routing workspace with failing contract suite

- fifth npm workspace @araharah/routing (buildless TS, search/ precedent)
- root delegates routing:test / routing:typecheck / routing:corpus
- C1-C6 RED: contract gates fail while src/types.ts + seed are absent

routing/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "@araharah/routing",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "test": "node test/runner.mjs",
+    "typecheck": "tsc --noEmit"
+  },
+  "devDependencies": {
+    "typescript": "^5.9.3"
+  }
+}