Join lead-47's node-engine seat whole into the registry milestone, in its own Go module and npm package

The node-engine seat, defined whole by lead-47's L3 (ADR 0618, ADR 0613 §3), is regenerated in A1's layout (ADR 0625 §1,
§3): go/seats/nodeengine a Go module of its own, ts/seats/nodeengine an npm package of its own, and module.json declares
go-nodeengine and ts-nodeengine. seatgen -check finds nothing out of step.

Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig

ts/seats/nodeengine/package.json

@@ -0,0 +1,19 @@
+{
+  "description": "The contract of the seat node-engine, generated from its definition.",
+  "devDependencies": {
+    "typescript": "^5.6.0"
+  },
+  "exports": {
+    ".": "./dist/index.js"
+  },
+  "files": [
+    "dist"
+  ],
+  "name": "@novox/mesh-contracts-node-engine",
+  "scripts": {
+    "build": "tsc",
+    "prepare": "tsc"
+  },
+  "type": "module",
+  "version": "0.1.0"
+}