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/overview/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "overview",
+  "version": "1.0.0",
+  "private": true,
+  "description": "High-level overview of the Verae Time × Zapier system, modules, uptime, NATS cluster, and docs index"
+}