Add overview repo and verae-nats-process expansion template

High-level system map with diagrams, TOC, and a docs index. Template
worker shows how to add a new verae.* address for search, storage, or
unplanned functions without teaching Zapier NATS.

packages/verae-nats-process/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "verae-nats-process",
+  "version": "0.1.0",
+  "type": "module",
+  "description": "Template JetStream worker for a new verae.* address (copy this repo to expand)",
+  "scripts": {
+    "start": "node src/worker.js",
+    "test": "node --test test/*.test.js"
+  },
+  "engines": { "node": ">=20" }
+}