Add the TypeScript twin of the sealed box, proven by the Go package's fixtures (issue 650)

(Also replaces the placeholder package.json the previous commit carried by mistake.)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

package.json

@@ -1 +1,30 @@
-PKGJSON
+{
+  "name": "@novox/mesh-sdk",
+  "version": "0.1.14",
+  "description": "The stable spine a Novox Mesh module's own code builds against.",
+  "type": "module",
+  "exports": {
+    ".": "./dist/index.js",
+    "./contracts": "./dist/contracts/index.js",
+    "./provisioner": "./dist/provisioner/index.js",
+    "./tools": "./dist/tools/index.js",
+    "./messaging": "./dist/messaging/index.js",
+    "./events": "./dist/events/index.js",
+    "./primitives": "./dist/primitives/index.js",
+    "./stdio": "./dist/stdio/index.js",
+    "./state": "./dist/state/index.js",
+    "./seal": "./dist/seal/index.js"
+  },
+  "files": [
+    "dist"
+  ],
+  "scripts": {
+    "build": "tsc",
+    "test": "node --test --experimental-strip-types 'test/*.test.ts'",
+    "prepare": "tsc"
+  },
+  "devDependencies": {
+    "@types/node": "^22.0.0",
+    "typescript": "^5.6.0"
+  }
+}